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E948 Oxygen is used in packaging fruits, vegetables, meats and fish in a protective atmosphere.
It makes E948 Oxygen possible to extend the shelf life of food products by slowing rotting processes and maintaining their natural appearance, taste and nutritional value.
E948 Oxygen is a gas used in the food industry to package products in a protective atmosphere.
CAS Number: 7782-44-7
EC Number: 231-956-9
Molecular Formula: O₂
Molecular Weight: 31.998 g/mol
SYNONYMS:
Oxygen, Molecular Oxygen, Dioxygen, Oxygen Gas, Gaseous Oxygen, Liquid Oxygen, O2, Oxygen Molecule, Pure Oxygen, Compressed Oxygen, Refrigerated Liquid Oxygen, Oxidizing Gas, Medical Oxygen, Food Grade Oxygen, Oxygen (O₂)
E948 Oxygen is a chemical element; it has the symbol O and its atomic number is 8.
E948 Oxygen is a member of the chalcogen group in the periodic table.
E948 Oxygen is highly reactive, a nonmetal, and a potent oxidizing agent that readily forms oxides with most elements as well as with other compounds.
E948 Oxygen is the most abundant element in Earth's crust, making up almost half of the Earth's crust in the form of various oxides such as water, carbon dioxide, iron oxides, and silicates.
E948 Oxygen is also the third-most abundant element in the universe after hydrogen and helium.
At standard temperature and pressure, two E948 Oxygen atoms will bind covalently to form diOxygen, a colorless and odorless diatomic gas with the chemical formula O2.
Dioxygen gas currently constitutes approximately 20.95% molar fraction of the Earth's atmosphere, though this has changed considerably over long periods of time in Earth's history.
The much rarer allotrope of E948 Oxygen, ozone (O3), strongly absorbs the UVB and UVC wavelengths and forms a protective ozone layer at the lower stratosphere, which shields the biosphere from ionizing ultraviolet radiation.
However, ozone present at the surface is a corrosive byproduct of smog and thus an air pollutant.
All eukaryotic organisms, including plants, animals, fungi, algae, and most protists, need E948 Oxygen for cellular respiration, a process that extracts chemical energy by the reaction of E948 Oxygen with organic molecules derived from food and releases carbon dioxide as a waste product.
Many major classes of organic molecules in living organisms contain E948 Oxygen atoms, such as proteins, nucleic acids, carbohydrates, and fats, as do the major constituent inorganic compounds of animal shells, teeth, and bone.
Most of the mass of living organisms is E948 Oxygen as a component of water, the major constituent of lifeforms.
E948 Oxygen in Earth's atmosphere is produced by biotic photosynthesis, in which photon energy in sunlight is captured by chlorophyll to split water molecules and then react with carbon dioxide to produce carbohydrates, with E948 Oxygen released as a byproduct.
E948 Oxygen is too chemically reactive to remain a free element in air without being continuously replenished by the photosynthetic activities of autotrophs such as cyanobacteria, chloroplast-bearing algae, and land plants.
E948 Oxygen was isolated by Michael Sendivogius before 1604, but it is commonly believed that the element was discovered independently by Carl Wilhelm Scheele, in Uppsala, in 1773 or earlier, and Joseph Priestley in Wiltshire, in 1774.
Priority is often given for Priestley because his work was published first.
Priestley, however, called E948 Oxygen "dephlogisticated air", and did not recognize it as a chemical element.
In 1777, Antoine Lavoisier first recognized E948 Oxygen as a chemical element and correctly characterized the role it plays in combustion.
E948 Oxygen is a colorless, odorless gas, essential for life, which plays a key role in the respiration process and is used in food technologies to preserve the freshness and color of food products.
E948 Oxygen allows packaged fruits and vegetables to maintain their natural respiration process, which is important for preserving their freshness and extending their shelf life.
As one of the basic elements of the atmosphere, E948 Oxygen has properties that help maintain the viability of food products, especially fruits and vegetables.
E948 Oxygen helps preserve the natural color of meat and maintain the organoleptic properties of produce.
USES and APPLICATIONS of E948 OXYGEN:
Common industrial uses of E948 Oxygen include production of steel, plastics and textiles, brazing, welding and cutting of steels and other metals, rocket propellant, E948 Oxygen therapy, and life-support systems in aircraft, submarines, spaceflight, and diving.
E948 Oxygen is used in packaging fruits, vegetables, meats and fish in a protective atmosphere.
It makes E948 Oxygen possible to extend the shelf life of food products by slowing rotting processes and maintaining their natural appearance, taste and nutritional value.
E948 Oxygen is a gas used in the food industry to package products in a protective atmosphere.
-Medical uses of E948 Oxygen:
Uptake of O2 from the air is the essential purpose of respiration, so E948 Oxygen supplementation is used in medicine.
Treatment not only increases E948 Oxygen levels in the patient's blood but has the secondary effect of decreasing resistance to blood flow in many types of diseased lungs, easing work load on the heart.
E948 Oxygen therapy is used to treat emphysema, pneumonia, some heart disorders (congestive heart failure), some disorders that cause increased pulmonary artery pressure, and any disease that impairs the body's ability to take up and use gaseous E948 Oxygen.
Treatments are flexible enough to be used in hospitals, the patient's home, or increasingly by portable devices.
E948 Oxygen tents were once commonly used in E948 Oxygen supplementation, but have since been replaced mostly by the use of E948 Oxygen masks or nasal cannulas.
Hyperbaric (high-pressure) medicine uses special E948 Oxygen chambers to increase the partial pressure of O2 around the patient and, when needed, the medical staff.
Carbon monoxide poisoning, gas gangrene, and decompression sickness (the 'bends') are sometimes addressed with this therapy.
Increased O2 concentration in the lungs helps to displace carbon monoxide from the heme group of hemoglobin.
E948 Oxygen gas is poisonous to the anaerobic bacteria that cause gas gangrene, so increasing its partial pressure helps kill the bacteria and alleviates gas gangrene.
Decompression sickness occurs in divers who decompress too quickly after a dive, resulting in bubbles of inert gas, mostly nitrogen and helium, forming in the blood.
Increasing the pressure of O2 as soon as possible helps to redissolve the bubbles back into the blood so that these excess gasses can be exhaled naturally through the lungs.
Normobaric E948 Oxygen administration at the highest available concentration is frequently used as first aid for any diving injury that may involve inert gas bubble formation in the tissues.
There is epidemiological support for its use from a statistical study of cases recorded in a long term database
-Industrial uses of E948 Oxygen:
Smelting of iron ore into steel consumes 55% of commercially produced E948 Oxygen.
In this process, E948 Oxygen is injected through a high-pressure lance into molten iron, which removes sulfur impurities and excess carbon as the respective oxides, SO2 and CO2.
The reactions are exothermic, so the temperature increases to 1,700 °C.
Another 25% of commercially produced E948 Oxygen is used by the chemical industry.
Ethylene is reacted with E948 Oxygen to create ethylene oxide, which, in turn, is converted into ethylene glycol; the primary feeder material used to manufacture a host of products, including antifreeze and polyester polymers (the precursors of many plastics and fabrics).
Most of the remaining 20% of commercially produced E948 Oxygen is used in medical applications, metal cutting and welding, as an oxidizer in rocket fuel, and in water treatment.
E948 Oxygen is used in oxyacetylene welding, burning acetylene with O2 to produce a very hot flame.
In this process, metal up to 60 cm (24 in) thick is first heated with a small oxy-acetylene flame and then quickly cut by a large stream of E948 Oxygen.
-E948 Oxygen for the food industry:
In the food industry, E948 Oxygen is used to extend the shelf life of various foods and to stabilise their quality.
E948 Oxygen is used as a shielding gas for beef products and steaks, for example.
In this regard, the E948 Oxygen in the packaging helps to prevent the growth of anaerobic microorganisms.
This preserves the natural red colour of the meat for longer.
With our E948 Oxygen generators, we supply high quality solutions for the stationary and mobile production of E948 Oxygen for different applications, including for low volume requirements.
E948 Oxygen is a food additive classified as halal.
E948 Oxygen is E948 Oxygen (O₂), a naturally occurring chemical element that makes up approximately 21% of the Earth's atmosphere.
In the food industry, E948 Oxygen is used as a packaging gas, propellant, and preservative in Modified Atmosphere Packaging (MAP).
Common uses of E948 Oxygen include extending the shelf life of fresh vegetables, stabilizing myoglobin to maintain the red color of packaged meats, and creating a frothy texture in ready-made desserts such as creams, puddings, and quarks.
E948 Oxygen is also used in Modified Atmosphere Packaging to preserve food properties and prevent spoilage.
The presence of E948 Oxygen is generally to be avoided in most food products because of the phenomena of oxidative rancidity and proliferation of aerobic bacteria.
E948 Oxygen supports the basic metabolism of breathing fruits and vegetables and is also necessary for maintaining the red coloration of fresh beef.
A naturally occurring gas, E948 Oxygen, is used in food packaging to keep products fresh, particularly for modified atmosphere packaging of fresh produce and seafood.
It's literally the air we breathe — no toxicity concerns whatsoever.
Approved for use in minimal food categories, E948 Oxygen serves a purely technical function.
Food additive with propellant gas role of E948 Oxygen, used in the food industry for the introduction of vegetable dishes in controlled atmosphere packaging, in order to keep and preserve the properties of food.
-Life support and recreational use E948 Oxygen:
In modern space suits, which surround their occupant's body, E948 Oxygen gas is used as a low-pressure breathing gas.
These devices use nearly pure E948 Oxygen at about one-third normal pressure, resulting in a normal blood partial pressure of O2.
This trade-off of higher E948 Oxygen concentration for lower pressure is needed to maintain suit flexibility.
Scuba and surface-supplied underwater divers and submarines also rely on artificially delivered O2.
Submarines, submersibles, and atmospheric diving suits usually operate at normal atmospheric pressure.
Breathing air is scrubbed of carbon dioxide by chemical extraction and E948 Oxygen is replaced to maintain a constant partial pressure.
Ambient pressure divers breathe air or gas mixtures with an E948 Oxygen fraction suited to the operating depth.
Pure or nearly pure O2 use in diving at pressures higher than atmospheric is usually limited to rebreathers, or decompression at relatively shallow depths (~6 meters depth, or less), or medical treatment in recompression chambers at pressures up to 2.8 bar, where acute E948 Oxygen toxicity can be managed without the risk of drowning.
Deeper diving requires significant dilution of O2 with other gases, such as nitrogen or helium, to prevent E948 Oxygen toxicity.
People who climb mountains or fly in non-pressurized fixed-wing aircraft sometimes have supplemental O2 supplies.
Pressurized commercial airplanes have an emergency supply of O2 automatically supplied to the passengers in case of cabin depressurization.
Sudden cabin pressure loss activates chemical E948 Oxygen generators above each seat, causing E948 Oxygen masks to drop.
Pulling on the masks "to start the flow of E948 Oxygen" as cabin safety instructions dictate, forces iron filings into the sodium chlorate inside the canister.
A steady stream of E948 Oxygen gas is then produced by the exothermic reaction.
E948 Oxygen, as a mild euphoric, has a history of recreational use in E948 Oxygen bars and in sports.
E948 Oxygen bars are establishments found in the United States since the late 1990s that offer higher than normal O2 exposure for a minimal fee.
Professional athletes, especially in American football, sometimes go off-field between plays to don E948 Oxygen masks to boost performance.
The pharmacological effect is doubted; a placebo effect is a more likely explanation.
Available studies support a performance boost from E948 Oxygen enriched mixtures only if it is inhaled during aerobic exercise.
Other recreational uses of E948 Oxygen that do not involve breathing include pyrotechnic applications, such as George Goble's five-second ignition of barbecue grills
E948 OXYGENAND ITS FUNCTIONS IN FOOD
As a food additive, E948 Oxygen plays an irreplaceable role in maintaining the freshness, quality and nutritional value of food products.
The use of E948 Oxygen in protective atmosphere packaging technologies makes it possible to extend the life of food products, to the benefit of producers and consumers
Food additive with propellant gas role, used in the food industry for the introduction of vegetable dishes in controlled atmosphere packaging, in order to keep and preserve the properties of food
CHARACTERISTICS of E948 OXYGEN:
Properties and molecular structure
At standard temperature and pressure, E948 Oxygen is a colorless, odorless, and tasteless gas with the molecular formula O2, referred to as dioxygen.
As dioxygen, two E948 Oxygen atoms are chemically bound to each other.
The bond can be variously described based on level of theory, but is reasonably and simply described as a covalent double bond that results from the filling of molecular orbitals formed from the atomic orbitals of the individual E948 Oxygen atoms, the filling of which results in a bond order of two.
More specifically, the double bond is the result of sequential, low-to-high energy, or Aufbau, filling of orbitals, and the resulting cancellation of contributions from the 2s electrons, after sequential filling of the low σ and σ* orbitals; σ overlap of the two atomic 2p orbitals that lie along the O–O molecular axis and π overlap of two pairs of atomic 2p orbitals perpendicular to the O–O molecular axis, and then cancellation of contributions from the remaining two 2p electrons after their partial filling of the π* orbitals.
This combination of cancellations and σ and π overlaps results in diOxygen's double-bond character and reactivity, as well as the presence of a triplet electronic ground state.
An electron configuration with two unpaired electrons, as is found in diOxygen orbitals (see the filled π* orbitals in the diagram), that are of equal energy—i.e., degenerate—is a configuration termed a spin triplet state.
Hence, the ground state of the O2 molecule is referred to as triplet E948 Oxygen.
The highest-energy, partially filled orbitals are antibonding, and so their filling weakens the bond order from three to two.
Because of its unpaired electrons, triplet E948 Oxygen reacts only slowly with most organic molecules, which have paired electron spins; this prevents spontaneous combustion.
In the triplet form, O2 molecules are paramagnetic.
That is, they impart magnetic character to E948 Oxygen when it is in the presence of a magnetic field, because of the spin of the unpaired electrons in the molecule and the negative exchange energy between neighboring O2 molecules.
Liquid E948 Oxygen is so magnetic that, in laboratory demonstrations, a bridge of liquid E948 Oxygen may be supported against its own weight between the poles of a powerful magnet.
E948 Oxygen's paramagnetism can be used in paramagnetic E948 Oxygen gas analysers that determine gaseous E948 Oxygen concentration, especially in industrial process control and medicine.
Singlet E948 Oxygen is a name given to several higher-energy species of molecular O2 in which all the electron spins are paired.
It is much more reactive with common organic molecules than normal (triplet) molecular E948 Oxygen.
In nature, singlet E948 Oxygen is commonly formed from water during photosynthesis, using the energy of sunlight.
It is also produced in the troposphere by the photolysis of ozone by light of short wavelength and by the immune system as a source of active E948 Oxygen.
Carotenoids in photosynthetic organisms (and possibly animals) play a major role in absorbing energy from singlet E948 Oxygen and converting it to the unexcited ground state before it can cause harm to tissues
ALLOTROPES of E948 OXYGEN:
The common allotrope of elemental E948 Oxygen on Earth is called dioxygen, O2, the allotrope that is major part of the Earth's atmospheric E948 Oxygen (see occurrence).
O2 has a bond length of 121 pm and a bond energy of 498 kJ/mol.
Trioxygen (O3) is usually known as ozone and is a very reactive allotrope of E948 Oxygen that is damaging to lung tissue.
Ozone is produced in the upper atmosphere when O2 combines with atomic E948 Oxygen made by the splitting of O2 by ultraviolet (UV) radiation.
Since ozone absorbs strongly in the UV region of the spectrum, the ozone layer of the upper atmosphere functions as a protective radiation shield for the planet.
Near the Earth's surface, ozone is a pollutant formed as a by-product of automobile exhaust.
At low Earth orbit altitudes, sufficient atomic E948 Oxygen is present to cause corrosion of spacecraft.
The metastable molecule tetraoxygen (O4) was discovered in 2001 and was assumed to exist in one of the six phases of solid E948 Oxygen.
In 2006, this phase, created by pressurizing O2 to 20 GPa, was shown to form a rhombohedral O8 cluster.
This cluster has the potential to be a much more powerful oxidizer than either O2 or O3 and may therefore be used in rocket fuel.
A metallic phase was discovered in 1990 when solid E948 Oxygen is subjected to a pressure of above 96 GPa; it was shown in 1998 that at very low temperatures, this phase becomes superconducting.
PHYSICAL PROPERTIES of E948 OXYGEN:
E948 Oxygen dissolves more readily in water than nitrogen does.
Water in equilibrium with air contains approximately 1 molecule of dissolved O2 for every 2 molecules of N2 (1:2), compared with an atmospheric ratio of approximately 1:4.
The solubility of E948 Oxygen in water is temperature-dependent, and about twice as much (14.6 mg/L) dissolves at 0 °C (32 °F) than at 20 °C (68 °F) (7.6 mg/L).
At 25 °C (77 °F) and 1 standard atmosphere (101.325 kPa) in air, freshwater can dissolve about 6.04 milliliters (mL) of E948 Oxygen per liter, while seawater contains about 4.95 mL per liter.
At 5 °C (41 °F) the solubility increases to 9.0 mL (50% more than at 25 °C (77 °F)) per liter for freshwater and 7.2 mL (45% more) per liter for sea water.
E948 Oxygen condenses at 90.20 K (−182.95 °C, −297.31 °F) and freezes at 54.36 K (−218.79 °C, −361.82 °F).
Both liquid and solid O2 are clear substances with a light sky-blue color caused by absorption in the red (in contrast with the blue color of the sky, which is due to Rayleigh scattering of blue light).
High-purity liquid O2 is usually obtained by the fractional distillation of liquefied air.
Liquid E948 Oxygen may also be condensed from air using liquid nitrogen as a coolant.
Liquid E948 Oxygen is a highly reactive substance and must be segregated from combustible materials.
The spectroscopy of molecular E948 Oxygen is associated with the atmospheric processes of aurora and airglow.
The absorption in the Herzberg continuum and Schumann–Runge bands in the ultraviolet produces atomic E948 Oxygen that is important in the chemistry of the middle atmosphere.
Excited-state singlet molecular E948 Oxygen is responsible for red chemiluminescence in solution.
ISOTOPES AND STELLAR ORIGIN of E948 OXYGEN:
Naturally occurring E948 Oxygen is composed of three stable isotopes, 16O, 17O, and 18O, with 16O being the most abundant (99.762% natural abundance).
16O is one of the dominant fusion products in massive stars.
It is synthesized at the end of the triple-alpha process with some synthesis in the neon burning process.
Both 17O and 18O require seed nuclei.
17O is primarily made by the burning of hydrogen into helium during the CNO cycle, making it a common isotope in the hydrogen burning zones of stars.
Most 18O is produced when 14N (made abundant from CNO burning) captures a 4He nucleus, making 18O common in the helium-rich zones of evolved, massive stars.
Fifteen radioisotopes have been characterized, ranging from 11O to 28O.
The most stable are 15O with a half-life of 122.24 seconds and 14O with a half-life of 70.606 seconds.
All of the remaining radioactive isotopes have half-lives that are less than 27 seconds, and the majority of them have half-lives that are less than 83 milliseconds.
The most common decay mode of the isotopes lighter than 16O is β+ decay to yield nitrogen, and the most common mode for the isotopes heavier than 18O is beta decay to yield fluorine.
OCCURRENCE of E948 OXYGEN:
E948 Oxygen is the third most abundant chemical element in the universe, after hydrogen and helium.
About 0.9% of the Sun's mass is E948 Oxygen.
E948 Oxygen constitutes 49.2% of the Earth's crust by mass as part of oxide compounds such as silicon dioxide and is the most abundant element by mass in the Earth's crust.
E948 Oxygen is also the major component of the world's oceans (88.8% by mass).
E948 Oxygen gas is the second most common component of the Earth's atmosphere, taking up 20.8% of its volume and 23.1% of its mass (some 1015 tonnes).
Earth is unusual among the planets of the Solar System in having such a high concentration of E948 Oxygen gas in its atmosphere.
Mars (with 0.1% O2 by volume) and Venus have much less.
The O2 surrounding those planets is produced solely by the action of ultraviolet radiation on E948 Oxygen-containing molecules such as carbon dioxide.
The unusually high concentration of E948 Oxygen gas on Earth is the result of the E948 Oxygen cycle.
This biogeochemical cycle describes the movement of E948 Oxygen within and between its three main reservoirs on Earth: the atmosphere, the biosphere, and the lithosphere.
The main driving factor of the E948 Oxygen cycle is photosynthesis, which is responsible for modern Earth's atmosphere.
Photosynthesis releases E948 Oxygen into the atmosphere, while respiration, decay, and combustion remove it from the atmosphere.
In the present equilibrium, production and consumption occur at the same rate.
E948 Oxygen levels in the atmosphere are trending slightly downward globally, possibly because of fossil-fuel burning
Free E948 Oxygen also occurs in solution in the world's water bodies.
The increased solubility of O2 at lower temperatures (see Physical properties) has important implications for ocean life, as polar oceans support a much higher density of life due to their higher E948 Oxygen content.
Scientists assess this aspect of water quality by measuring the water's biochemical E948 Oxygen demand, or the amount of O2 needed to restore it to a normal concentration.
Significant deE948 Oxygenation has been observed in tropical oceans.
Warming oceans' waters are expected to lose E948 Oxygen over the next century and into the future for a thousand years; the possible consequences include minimal E948 Oxygen zones which are unable to support macrofauna.
ANALYSIS of E948 OXYGEN:
Paleoclimatologists measure the ratio of E948 Oxygen-18 and E948 Oxygen-16 in the shells and skeletons of marine organisms to determine the climate millions of years ago (see E948 Oxygen isotope ratio cycle).
Seawater molecules that contain the lighter isotope, E948 Oxygen-16, evaporate at a slightly faster rate than water molecules containing the 12% heavier E948 Oxygen-18, and this disparity increases at lower temperatures.
During periods of lower global temperatures, snow and rain from that evaporated water tends to be higher in E948 Oxygen-16, and the seawater left behind tends to be higher in E948 Oxygen-18.
Marine organisms then incorporate more E948 Oxygen-18 into their skeletons and shells than they would in a warmer climate.
Paleoclimatologists also directly measure this ratio in the water molecules of ice core samples as old as hundreds of thousands of years.
Planetary geologists have measured the relative quantities of E948 Oxygen isotopes in samples from the Earth, the Moon, Mars, and meteorites, but were long unable to obtain reference values for the isotope ratios in the Sun, believed to be the same as those of the primordial solar nebula.
Analysis of a silicon wafer exposed to the solar wind in space and returned by the crashed Genesis spacecraft has shown that the Sun has a higher proportion of E948 Oxygen-16 than does the Earth.
The measurement implies that an unknown process depleted E948 Oxygen-16 from the Sun's disk of protoplanetary material prior to the coalescence of dust grains that formed the Earth.
E948 Oxygen presents two spectrophotometric absorption bands peaking at wavelengths of 687 and 760 nm.
Some remote sensing scientists have proposed using the measurement of the radiance coming from vegetation canopies in those bands to characterize plant health status from a satellite platform.
This approach exploits the fact that in those bands it is possible to discriminate the vegetation's reflectance from its fluorescence, which is much weaker.
The measurement is technically difficult owing to the low signal-to-noise ratio and the physical structure of vegetation; but it has been proposed as a possible method of monitoring the carbon cycle from satellites on a global scale
COMPOUNDS of E948 OXYGEN:
The oxidation state of E948 Oxygen is −2 in almost all known compounds of E948 Oxygen.
The oxidation state −1 is found in a few compounds, such as peroxides.
Compounds containing E948 Oxygen in other oxidation states are very uncommon: −1/2 (superoxides), −1/3 (ozonides), 0 (elemental, hypofluorous acid), +1/2 (diOxygenyl), +1 (diOxygen difluoride), and +2 (E948 Oxygen difluoride).
Oxides and other inorganic compoundsWater (H2O) is an oxide of hydrogen and the most familiar E948 Oxygen compound.
Hydrogen atoms are covalently bonded to E948 Oxygen in a water molecule but also have an additional attraction (about 23.3 kJ/mol per hydrogen atom) to an adjacent E948 Oxygen atom in a separate molecule.
These hydrogen bonds between water molecules hold them approximately 15% closer than what would be expected in a simple liquid with just van der Waals forces.
Due to its electronegativity, E948 Oxygen forms chemical bonds with almost all other elements to give corresponding oxides.
The surface of most metals, such as aluminium and titanium, are oxidized in the presence of air and become coated with a thin film of oxide that passivates the metal and slows further corrosion.
Many oxides of the transition metals are non-stoichiometric compounds, with slightly less metal than the chemical formula would show.
For example, the mineral FeO (wüstite) is written as Fe1−xO, where x is usually around 0.05.
E948 Oxygen is present in the atmosphere in trace quantities in the form of carbon dioxide (CO2).
The Earth's crustal rock is composed in large part of oxides of silicon (silica SiO2, as found in granite and quartz), aluminium (aluminium oxide Al2O3, in bauxite and corundum), iron (iron(III) oxide Fe2O3, in hematite and rust), and calcium carbonate (in limestone).
The rest of the Earth's crust is also made of E948 Oxygen compounds, in particular various complex silicates (in silicate minerals).
The Earth's mantle, of much larger mass than the crust, is largely composed of silicates of magnesium and iron.
Water-soluble silicates in the form of Na4SiO4, Na2SiO3, and Na2Si2O5 are used as detergents and adhesives.
E948 Oxygen also acts as a ligand for transition metals, forming transition metal diE948 Oxygen complexes, which feature metal–O2.
This class of compounds includes the heme proteins hemoglobin and myoglobin.
An exotic and unusual reaction occurs with PtF6, which oxidizes E948 Oxygen to give O+2PtF−6, diE948 Oxygenyl hexafluoroplatinate.
ORGANIC COMPOUNDS of E948 OXYGEN:
Among the most important classes of organic compounds that contain E948 Oxygen are (where "R" is an organic group): alcohols (R-OH); ethers (R-O-R); ketones (R-CO-R); aldehydes (R-CO-H); carboxylic acids (R-COOH); esters (R-COO-R); acid anhydrides (R-CO-O-CO-R); and amides (R-CO-NR2).
There are many important organic solvents that contain E948 Oxygen, including: acetone, methanol, ethanol, isopropanol, furan, THF, diethyl ether, dioxane, ethyl acetate, DMF, DMSO, acetic acid, and formic acid.
Acetone ((CH3)2CO) and phenol (C6H5OH) are used as feeder materials in the synthesis of many different substances.
Other important organic compounds that contain E948 Oxygen are: glycerol, formaldehyde, glutaraldehyde, citric acid, acetic anhydride, and acetamide.
Epoxides are ethers in which the E948 Oxygen atom is part of a ring of three atoms.
E948 Oxygen is similarly found in almost all biomolecules that are important to (or generated by) life.
E948 Oxygen reacts spontaneously with many organic compounds at or below room temperature in a process called autoxidation.
Most of the organic compounds that contain E948 Oxygen are not made by direct action of O2.
Organic compounds important in industry and commerce that are made by direct oxidation of a precursor include ethylene oxide and peracetic acid
BIOLOGICAL PRODUCTION AND ROLE of E948 OXYGEN:
Photosynthesis and respiration
In nature, free E948 Oxygen is produced as a byproduct of light-driven splitting of water during chlorophyllic photosynthesis.
According to some estimates, marine photoautotrophs such as red/green algae and cyanobacteria provide about 70% of the free
E948 Oxygen produced on Earth, and the rest is produced in terrestrial environments by plants.
Other estimates of the oceanic contribution to atmospheric E948 Oxygen are higher, while some estimates are lower, suggesting oceans produce ~45% of Earth's atmospheric E948 Oxygen each year.
A simplified overall formula for photosynthesis is
6 CO2 + 6 H2O + photons → C6H12O6 + 6 O2
or simply
carbon dioxide + water + sunlight → glucose + diOxygen
Photolytic E948 Oxygen evolution occurs in the thylakoid membranes of photosynthetic organisms and requires the energy of four photons.
Many steps are involved, but the result is the formation of a proton gradient across the thylakoid membrane, which is used to synthesize adenosine triphosphate (ATP) via photophosphorylation.
The O2 remaining (after production of the water molecule) is released into the atmosphere.
E948 Oxygen is used in mitochondria of eukaryotes to generate ATP during oxidative phosphorylation.
The reaction for aerobic respiration is essentially the reverse of photosynthesis and is simplified as
C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + 2880 kJ/mol
In aquatic animals, dissolved E948 Oxygen in water is absorbed by gills, through the skin, or via the gut; in terrestrial animals such as tetrapods, E948 Oxygen in air is actively taken into the body via lungs, where gas exchange takes place to diffuse E948 Oxygen into the blood and carbon dioxide out, and the body's circulatory system then transports the E948 Oxygen to other tissues where cellular respiration takes place.
However, in insects, the most successful and biodiverse terrestrial clade, E948 Oxygen is directly conducted to the internal tissues via a deep network of airways.
Hemoglobin in red blood cells binds O2, changing color from bluish red to bright red (CO2 is released from another part of hemoglobin through the Bohr effect).
Other terrestrial invertebrates use hemocyanin (molluscs and some arthropods) or hemerythrin (spiders and lobsters) instead.
A liter of blood can dissolve up to 200 cm3 of O2.
Until the discovery of anaerobic organisms, E948 Oxygen was thought to be a requirement for all complex life.
Reactive E948 Oxygen species, such as superoxide ion (O−2) and hydrogen peroxide (H2O2), are reactive by-products of E948 Oxygen use in organisms.
Parts of the immune system of higher organisms create peroxide, superoxide, and singlet E948 Oxygen to destroy invading microbes.
Reactive E948 Oxygen species also play an important role in the hypersensitive response of plants against pathogen attack.
E948 Oxygen is damaging to obligately anaerobic organisms, which were the dominant form of early life on Earth until O
2 began to accumulate in the atmosphere about 2.5 billion years ago during the Great E948 Oxygenation Event, about a billion years after the first appearance of these organisms.
An adult human at rest inhales 1.8 to 2.4 grams of E948 Oxygen per minute.
This amounts to more than 6 billion tonnes of E948 Oxygen inhaled by humanity per year
Living organisms
The free E948 Oxygen partial pressure in the body of a living vertebrate organism is highest in the respiratory system, and decreases along any arterial system, peripheral tissues, and venous system, respectively.
Partial pressure is the pressure that E948 Oxygen would have if it alone occupied the volume
Build-up in the atmosphere
Before photosynthesis evolved, Earth's atmosphere had little free diatomic elemental E948 Oxygen (O2).
E948 Oxygen began building up in the prebiotic atmosphere at approximately 2.45 Ga during the Neoarchean-Paleoproterozoic boundary, a paleogeological event known as the Great Oxygenation Event (GOE).
The concentrations of O2 attained were less than 10% of today's and probably fluctuated greatly.
Around 500Mya a second event known as the Neoproterozoic E948 Oxygenation Event lead to E948 Oxygen levels similar or even higher than the present.
E948 Oxygen is both a result of biological activity and a key enabler.
Photosynthesis produces E948 Oxygen while plants and animals using aerobic respiration consume it.
Consequently, the evolution of life is closely related to the concentration of available E948 Oxygen.
Understanding the relationship between E948 Oxygen and evolution would aid in seeking evidence of extraterrestrial life in exoplanet data.
E948 Oxygen concentration plays a key role in the geochemical composition of sedimentary rocks, making E948 Oxygen concentration important for geology and sedimentary rocks important for understanding E948 Oxygen concentration over geologic time.
The increase in E948 Oxygen concentrations had wide-ranging and significant impacts on Earth's geochemistry and biosphere.
However, detailed connections between E948 Oxygen and evolution remain elusive.
Variations in atmospheric E948 Oxygen concentration may have shaped past climates.
When E948 Oxygen declined, atmospheric density dropped, which in turn increased surface evaporation, causing precipitation increases and warmer temperatures.
Extraterrestrial free E948 Oxygen
In the field of astrobiology and in the search for extraterrestrial life, E948 Oxygen is a strong biosignature.
The value of this signature dependents on the stability of the E948 Oxygen content on Earth.
Simulations of Earth's E948 Oxygen balance have estimated that E948 Oxygen on Earth will last for about one billion years.
Another potential issue is that E948 Oxygen may be produced abiotically on celestial bodies with processes and conditions (such as a peculiar hydrosphere) which allow free E948 Oxygen, like with Europa's and Ganymede's thin E948 Oxygen atmospheres.
Industrial production
Every year, one hundred million tonnes of O2 are extracted from air for industrial uses.
The most common method of extraction is fractional distillation of liquefied air, with N2 distilling as a vapor while O2 is left as a liquid.
The other primary method of producing O2 is passing a stream of clean, dry air through one bed of a pair of identical zeolite molecular sieves, which absorbs the nitrogen and delivers a gas stream that is 90% to 93% O2.
Simultaneously, nitrogen gas is released from the other nitrogen-saturated zeolite bed, by reducing the chamber operating pressure and diverting part of the E948 Oxygen gas from the producer bed through it, in the reverse direction of flow.
After a set cycle time the operation of the two beds is interchanged, thereby allowing for a continuous supply of gaseous E948 Oxygen to be pumped through a pipeline.
This is known as pressure swing adsorption.
E948 Oxygen gas is increasingly obtained by these non-cryogenic technologies (see also the related vacuum swing adsorption).
In academic laboratories, E948 Oxygen can be prepared by heating together potassium chlorate mixed with a small proportion of manganese dioxide.
E948 Oxygen gas can also be produced through electrolysis of water into molecular E948 Oxygen and hydrogen.
DC electricity must be used: if AC is used, the gases in each limb consist of hydrogen and E948 Oxygen in the explosive ratio 2:1.
A similar method is the electrocatalytic E948 Oxygen evolution from oxides and oxoacids.
Chemical catalysts can be used as well, such as in chemical E948 Oxygen generators or E948 Oxygen candles that are used as part of the life-support equipment on submarines, and are still part of standard equipment on commercial airliners in case of depressurization emergencies.
Another air separation method is forcing air to dissolve through ceramic membranes based on zirconium dioxide by either high pressure or an electric current to produce nearly pure E948 Oxygen gas.
STORAGE of E948 OXYGEN:
E948 Oxygen storage methods include high-pressure E948 Oxygen tanks, cryogenics, and chemical compounds.
For economic reasons, E948 Oxygen is often transported in bulk as a liquid in specially insulated tankers, since one liter of liquefied E948 Oxygen is equivalent to 840 liters of gaseous E948 Oxygen at atmospheric pressure and 20 °C (68 °F).
Such tankers are used to refill bulk liquid-E948 Oxygen storage containers, which stand outside hospitals and other institutions that need large volumes of pure E948 Oxygen gas.
Liquid E948 Oxygen is passed through heat exchangers, which convert the cryogenic liquid into gas before it enters the building.
E948 Oxygen is also stored and shipped in smaller cylinders containing the compressed gas; a form that is useful in certain portable medical applications and oxy-fuel welding and cutting.
HISTORY OF STUDY of E948 OXYGEN:
The modern concept of the element E948 Oxygen developed over five centuries and included many related discoveries and unsuccessful theories.
Multiple people made different contributions to the concept.
No one person discovered E948 Oxygen.
Early experiments
One of the first known experiments on the relationship between combustion and air was conducted by the 2nd-century BCE Greek writer on mechanics, Philo of Byzantium.
In his work Pneumatica, Philo observed that inverting a vessel over a burning candle and surrounding the vessel's neck with water resulted in some water rising into the neck.
Philo incorrectly surmised that parts of the air in the vessel were converted into the classical element fire and thus were able to escape through pores in the glass.
Many centuries later Ibn al-Nafis, writing in 1250 CE, correctly described Oxygenation of blood in the circulatory system; Michael Servetus rediscovered this concept in 1553 but his books were systematically destroyed.
A scientifically based and influential description was published by William Harvey in 1628.
Leonardo da Vinci observed that a portion of air is consumed during combustion and respiration.
Polish alchemist, philosopher, and physician Michael Sendivogius (Michał Sędziwój), writing in 1604, described a substance contained in air, referring to it as cibus vitae ('food of life'); this substance is identical with E948 Oxygen.
During his experiments, performed between 1598 and 1604, Sendivogius properly recognized that the substance is equivalent to the gaseous byproduct released by the thermal decomposition of potassium nitrate.
However, this important connection was not understood by contemporary scientists like Robert Boyle.
Unaware of Sendivogius's work, John Mayow wrote about a portion of air that provided heat in a fire and the human body.
This work was ignored because it failed to align with the prevailing phlogiston theory of air and fire.
Mayow observed that antimony increased in weight when heated, and inferred that the nitroaereus must have combined with it.
He also thought that the lungs separate nitroaereus from air and pass it into the blood and that animal heat and muscle movement result from the reaction of nitroaereus with certain substances in the body.
Accounts of these and other experiments and ideas were published in 1668 in his work Tractatus duo in the tract "De respiratione".
After Robert Boyle proved that air is necessary for combustion in the late 17th century, English chemist John Mayow refined this work by showing that fire requires only a part of air that he called spiritus nitroaereus.
In one experiment, he found that placing either a mouse or a lit candle in a closed container over water caused the water to rise and replace one-fourteenth of the air's volume before extinguishing the subjects.
From this, he surmised that nitroaereus is consumed in both respiration and combustion
Phlogiston theory
Robert Hooke, Ole Borch, Mikhail Lomonosov, and Pierre Bayen all produced E948 Oxygen in experiments in the 17th and the 18th century but none of them recognized it as a chemical element.
This may have been in part due to the prevalence of the philosophy of combustion and corrosion called the phlogiston theory, which was then the favored explanation of those processes.
Established in 1667 by the German alchemist J. J. Becher and modified by the chemist Georg Ernst Stahl by 1731, phlogiston theory stated that all combustible materials were made of two parts.
One part, called phlogiston, was given off when the substance containing it was burned, while the dephlogisticated part was thought to be its true form, or calx.
Highly combustible materials that leave little residue, such as wood or coal, were thought to be made mostly of phlogiston, whereas non-combustible substances that corrode, such as iron, contained very little.
Air did not play a role in phlogiston theory, nor were any initial quantitative experiments conducted to test the idea; instead, it was based on observations of what happens when something burns, that most common objects appear to become lighter and seem to lose something in the process.
Scientific era
Swedish pharmacist Carl Wilhelm Scheele produced and described some properties of E948 Oxygen sometime around 1770–1775 but did not publish his work until a few years later because he was unable to interpret his work in the framework of the phlogiston theory.
Scheele had produced E948 Oxygen gas by heating mercuric oxide (HgO) and various nitrates in 1771–1772.
After reading about Priestley's work in 1775, Scheele published in 1777, calling the gas "fire air" because E948 Oxygen was then the only known agent to support combustion.
In the meantime, on August 1, 1774, an experiment conducted by the British clergyman Joseph Priestley focused sunlight on mercuric oxide contained in a glass tube, which liberated a gas he named "dephlogisticated air".
He noted that candles burned brighter in the gas and that a mouse was more active and lived longer while breathing it.
After breathing the gas himself, Priestley wrote: "The feeling of it to my lungs was not sensibly different from that of common air, but I fancied that my breast felt peculiarly light and easy for some time afterwards."
Priestley published his findings in 1775 in a paper titled "An Account of Further Discoveries in Air", which was included in the second volume of his book titled Experiments and Observations on Different Kinds of Air.
The French chemist Antoine Lavoisier later claimed to have discovered the new substance independently.
Priestley visited Lavoisier in October 1774 and told him about his experiment and how he liberated the new gas.
Scheele had also dispatched a letter to Lavoisier on September 30, 1774, which described his discovery of the previously unknown substance, but Lavoisier never acknowledged receiving it (a copy of the letter was found in Scheele's belongings after his death).
Discrediting Phlogiston theory
Lavoisier conducted the first adequate quantitative experiments on oxidation and gave the first correct explanation of how combustion works.
He used these and similar experiments, which began in 1774, to discredit the phlogiston theory and to prove that the substance discovered by Priestley and Scheele was a chemical element.
In one experiment, Lavoisier observed that there was no overall increase in weight when tin and air were heated in a closed container.
He noted that air rushed in when he opened the container, which indicated that part of the trapped air had been consumed.
He also noted that the tin had increased in weight and that the increase was the same as the weight of the air that rushed back in.
This and other experiments on combustion were documented in his book "On General Combustion" (Sur la combustion en général), which was published in 1777.
In that work, he proved that air is a mixture of two gases: 'vital air', which is essential to combustion and respiration, and azote (from Greek ἄζωτον 'lifeless'), which did not support either.
Azote later became nitrogen in English, although it has kept the earlier name in French and several other European languages.
Etymology
Lavoisier renamed "vital air" to oxygène in 1777 from the Greek roots oxys (ὀξύς; "acid", literally 'sharp', from the taste of acids) and -genēs (-γενής; "producer", literally 'begetter') because he mistakenly believed that E948 Oxygen was a constituent of all acids.
Chemists (such as Sir Humphry Davy in 1812) eventually determined that Lavoisier was wrong in this regard (e.g. Hydrogen chloride (HCl) is a strong acid that does not contain E948 Oxygen), but by then the name was too well established.
E948 Oxygen entered the English language despite opposition by English scientists and the fact that the Englishman Priestley had first isolated the gas and written about it.
This is partly due to a poem praising the gas titled "E948 Oxygen" in the popular book The Botanic Garden (1791) by Erasmus Darwin, grandfather of Charles Darwin.
Later history
John Dalton's original atomic hypothesis presumed that all elements were monatomic and that the atoms in compounds would normally have the simplest atomic ratios with respect to one another.
For example, Dalton assumed that water's formula was HO, leading to the conclusion that the atomic mass of E948 Oxygen was 8 times that of hydrogen, instead of the modern value of about 16.
In 1805, Joseph Louis Gay-Lussac and Alexander von Humboldt showed that water is formed of two volumes of hydrogen and one volume of E948 Oxygen, and by 1811, Amedeo Avogadro had arrived at the correct interpretation of water's composition, based on what is now called Avogadro's law and the diatomic elemental molecules in those gases.
In 1879 the French brothers Quentin and Arthur Brin discovered a commercially viable reaction to create E948 Oxygen.
They realized that the known reversible reaction 2BaO(s) + O2(g) ↔ 2BaO2(s) was deactivated by the formation of barium carbonate from carbon dioxide in the air; treating air to remove the carbon dioxide allowed the reaction be reversed indefinitely.
Their company used the process between 1886 and 1906, at which point the more economical fractional distillation began to be used
By the late 19th century, scientists realized that air could be liquefied and its components isolated by compressing and cooling it.
Using a cascade method, Swiss chemist and physicist Raoul Pierre Pictet evaporated liquid sulfur dioxide in order to liquefy carbon dioxide, which in turn was evaporated to cool E948 Oxygen gas enough to liquefy it.
On December 22, 1877, he sent a telegram to the French Academy of Sciences in Paris announcing his discovery of liquid E948 Oxygen.
Just two days later, French physicist Louis Paul Cailletet announced his own method of liquefying molecular E948 Oxygen.
Only a few drops of the liquid were produced in each case and no meaningful analysis could be conducted.
E948 Oxygen was liquefied in a stable state for the first time on March 29, 1883, by Polish scientists Zygmunt Wróblewski and Karol Olszewski from Jagiellonian University.
In 1891 Scottish chemist James Dewar was able to produce enough liquid E948 Oxygen for study.
The first commercially viable process for producing liquid E948 Oxygen was independently developed in 1895 by German engineer Carl von Linde and British engineer William Hampson.
Both men lowered the temperature of air until it liquefied and then distilled the component gases by boiling them off one at a time and capturing them separately.
Later, in 1901, oxyacetylene welding was demonstrated for the first time by burning a mixture of acetylene and compressed O2.
This method of welding and cutting metal later became common.
In 1923, the American scientist Robert H. Goddard became the first person to develop a rocket engine that burned liquid fuel; the engine used gasoline for fuel and liquid E948 Oxygen as the oxidizer.
Goddard successfully flew a small liquid-fueled rocket 56 m at 97 km/h on March 16, 1926, in Auburn, Massachusetts.
PHYSICAL and CHEMICAL PROPERTIES of E948 OXYGEN:
Chemical Name: Oxygen
E Number: E948
CAS Number: 7782-44-7
EC Number: 231-956-9
Molecular Formula: O₂
Molecular Weight: 31.998 g/mol
Chemical Family: Diatomic nonmetal gas
Appearance: Colorless gas
Physical State: Gas under standard conditions
Odor: Odorless
Taste: Tasteless
Density: Approximately 1.429 g/L at 0°C and 1 atm
Boiling Point: −182.96°C
Melting Point: −218.79°C
Critical Temperature: −118.6°C
Critical Pressure: Approximately 50.4 bar
Water Solubility: Slightly soluble in water
Solubility in Organic Solvents: Soluble in some organic solvents
Oxidizing Properties: Strong oxidizing agent
Flammability: Non-flammable but strongly supports combustion
Chemical Reactivity: Highly reactive with many elements and compounds
Thermal Stability: Stable under normal conditions
Magnetic Properties: Paramagnetic
Color in Liquid Form: Pale blue
Color in Solid Form: Pale blue crystalline solid
Vapor Density: Approximately 1.1 relative to air
Autoignition Support: Accelerates ignition of combustible materials
Ionization Energy: High ionization potential
Electronegativity: 3.44 on the Pauling scale
Oxidation States: Usually −2 in compounds
Bond Type: Double covalent bond
Surface Tension of Liquid Oxygen: Low surface tension cryogenic liquid
Compressibility: Compressible gas
Diffusion Rate: Moderate diffusion in air
Shelf Stability: Stable when properly stored
Corrosiveness: Non-corrosive itself but enhances oxidation reactions
Cryogenic Properties: Extremely cold in liquid form
Explosive Hazard: May intensify combustion and explosion risks in oxygen-enriched environments
Biological Importance: Essential for aerobic respiration
Atmospheric Concentration: Approximately 20.95% of Earth’s atmosphere
Purity Grades: Industrial, medical, food-grade, and ultra-high purity grades available
Compatibility: Reactive with oils, greases, fuels, and combustible substances
Storage Conditions: Stored in high-pressure cylinders or cryogenic containers
Electrical Conductivity: Poor electrical conductor under standard conditions
Viscosity: Low gas viscosity
Heat Capacity: Moderate heat capacity
Thermal Conductivity: Higher thermal conductivity than many gases
Oxidation Potential: Very high oxidation potential
Decomposition: Does not decompose under standard conditions
Radiation Sensitivity: Stable under normal radiation exposure
Environmental Behavior: Naturally occurring atmospheric gas
Toxicity: Non-toxic at atmospheric concentrations but harmful at excessive partial pressures
Respiratory Role: Essential for cellular metabolism and respiration
Thermal conductivity: 26.58×10−3 W/(m⋅K)
Magnetic ordering: paramagnetic
Molar magnetic susceptibility: +3449.0×10−6 cm3/mol (293 K)
Speed of sound: 330 m/s (gas, at 27 °C)
CAS Number: 7782-44-7
Oxidation states: common: −2
−1, 0, +1 +2
Electronegativity: Pauling scale: 3.44
Ionization energies:
1st: 1313.9 kJ/mol
2nd: 3388.3 kJ/mol
3rd: 5300.5 kJ/mol
(more)
Covalent radius: 66±2 pm
Van der Waals radius: 152 pm
Phase at STP: gas
Melting point: (O2) 54.36 K (−218.79 °C, −361.82 °F)
Boiling point: (O2) 90.188 K (−182.962 °C, −297.332 °F)
Density (at STP): 1.429 g/L
when liquid (at b.p.): 1.141 g/cm3
Triple point: 54.361 K, 0.1463 kPa
Critical point: 154.581 K, 5.043 MPa
Heat of fusion: (O2) 0.444 kJ/mol
Heat of vaporization: (O2) 6.82 kJ/mol
Molar heat capacity: 14.689 J/(mol·K) (O)
29.378 J/(mol·K) (O2)
Specific heat capacity: 918.12 J/(kg·K) (O)
FIRST AID MEASURES of E948 OXYGEN:
-Description of first-aid measures
*General advice:
Show this material safety data sheet to the doctor in attendance.
*If inhaled:
After inhalation:
Fresh air.
*In case of skin contact:
Take off immediately all contaminated clothing.
Rinse skin with
water/ shower.
*In case of eye contact:
After eye contact:
Rinse out with plenty of water.
Call in ophthalmologist.
Remove contact lenses.
*If swallowed:
After swallowing:
Immediately make victim drink water (two glasses at most).
Consult a physician.
-Indication of any immediate medical attention and special treatment needed.
No data available
ACCIDENTAL RELEASE MEASURES of E948 OXYGEN:
-Environmental precautions:
Do not let product enter drains.
-Methods and materials for containment and cleaning up:
Cover drains.
Collect, bind, and pump off spills.
Observe possible material restrictions.
Take up dry.
Dispose of properly.
Clean up affected area.
FIRE FIGHTING MEASURES of E948 OXYGEN:
-Extinguishing media:
*Suitable extinguishing media:
Carbon dioxide (CO2)
Foam
Dry powder
*Unsuitable extinguishing media:
For this substance/mixture no limitations of extinguishing agents are given.
-Further information:
Prevent fire extinguishing water from contaminating surface water or the ground water system.
EXPOSURE CONTROLS/PERSONAL PROTECTION of E948 OXYGEN:
-Control parameters:
--Ingredients with workplace control parameters:
-Exposure controls:
--Personal protective equipment:
*Eye/face protection:
Use equipment for eye protection.
Safety glasses
*Body Protection:
protective clothing
*Respiratory protection:
Recommended Filter type: Filter A
-Control of environmental exposure:
Do not let product enter drains.
HANDLING and STORAGE of E948 OXYGEN:
-Conditions for safe storage, including any incompatibilities:
*Storage conditions:
Tightly closed.
Dry.
STABILITY and REACTIVITY of E948 OXYGEN:
-Chemical stability:
The product is chemically stable under standard ambient conditions (room temperature).
-Possibility of hazardous reactions:
No data available
