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EC number: 247-852-1 | CAS number: 26628-22-8
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Endpoint summary
Administrative data
Description of key information
Sodium azide is an inorganic substance and therefore biotic breakdown processes are not considered important when considering the environmental fate of the substance.
The abiotic breakdown of sodium azide in water, by dissociation and photolysis have been demonstrated to be important processes. Sodium azide is highly soluble in water and once dissolved it has been demonstrated to form hydrazoic acid. Two studies (Betterton, 2003 and US EPA, 1977) suggest that sodium azide is likely to undergo transformation in water when exposed to light, with the production of various reaction products, including nitrogen gas, metal nitrides and hydroxylamine.
In a study according to the OECD guideline 106 the mean Koc was determined to be 424 mL/g (Landsberg 2017). Also sodium azide has been shown to be hardly adsorbed by mineral soils, but is adsorbed by muck soils and by activated charcoal. It may be converted to hydrazoic acid in acid soils, and both the sodium azide and hydrazoic acid are readily leachable (WSSA 1983).
Additional information
Sodium azide does not contain any hydrolysable chemical groups. Therefore, the substance cannot undergo hydrolysis. Two review papers (Betterton 2003, and Ellenhorn 1997) on sodium azide are available that discuss the behaviour of sodium azide in water. Both of these studies suggest that sodium azide is highly soluble in water, and once dissolved will form hydrazoic acid, which is the corresponding acid in an acid-base equilibrium (which must not be confounded with hydrolysis).
According to Müller and Brous (1933), solid Sodium azide was found to be decomposed photochemically by wavelengths below approximately 405 nm. The rate of decomposition was directly proportional to the light intensity. Regarding wavelength of 254 nm no photolysis is reported by Betterton (2003). A phototransformation within the troposphere is not expected.
Two studies (Betterton 2003, and US EPA 1977) suggest that sodium azide is likely to undergo transformation in water when exposed to light, with the production of various reaction products, including nitrogen gas, metal nitrides and hydroxylamine.
Sodium azide has been shown to be hardly adsorbed by mineral soils, but is adsorbed by muck soils and by activated charcoal. It may be converted to hydrazoic acid in acid soils, and both the sodium azide and hydrazoic acid are readily leachable.
Since surface applied sodium azide is readily leached into soil, photodecomposition is not an important means of dissipation. In acid soils, sodium azide is readily converted to hydrazoic acid, which is highly volatile, moves readily through the soil, and can account for a major part of azide dissipation unless some type of vapor seal is employed (WSSA 1983).
The arithmetic mean Koc is calculated from five matrix-specific determinations as 424 mL/g.
Betterton (2003) report a Henry's law constant between 10 - 12.4 M/atm. Weiss (1996) state a volatility of hydrazoic acid (the protonated form of the azide anion) in acidified solution of 76 mm Hg /M, which is equal to 10.132 Pa/m^3/mol.
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