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EC number: 220-971-6 | CAS number: 2950-43-8
- 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
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Inorganic substance, therefore biodegradation testing not applicable. However, dissociation products may be used in nitrification processes. Furthermore, hydroxylamine is a natural intermediate in biological nitrification under aerobic conditions.
Key value for chemical safety assessment
Additional information
Summary according to the aquatic biodegradation as given EU-RAR draft 14. May 2008
Since no data are available for the test substance, a read-across was done to the inorganic source/surrogate substance Bis(hydroxylammonium)sulphate due to structural similarity.
In an aqueous environment, the surrogate substance bis(hydroxylammonium)sulphate is expected to dissociate to [NH3OH]+and [SO4]2-.
The hydroxyl-ammonium ion is expected to react to hydroxylamine (free base) and hydrogen. Hydroxyl-ammonium ion and hydroxylamine (free base) are in equilibrium according to the following reaction scheme:
[NH3-OH]+ < --> NH2-OH + H+
The estimated pKa for this reaction is 5.8. The amount of hydroxylammonium ion decreases rapidly at pH-values above 5. Only in very acidic environment, the substance is present as hydroxyl-ammonium ion. At pH 7, the amount of hydroxyl-ammonium ion is approximately 6 %, and at pH 8 nearly only the free base is present.
The free hydroxylamine base is very reactive and, at environmental conditions, is expected to decompose further by abiotic processes and nitrification. The expected ultimate degradation products are ammonia, nitrogen and water (Hollemann-Wiberg, 1995).
2NH2OH --> NH3+ HNO + H2O
2HNO --> N2O + H2O
NH2OH + HNO --> N2+ 2H2O
For several chemolithoautotrophic bacteria, such as Nitrosomas europea, Nitrosomas nitrosa and Nitrosococcus oceanus, mixotrophic growth on hydroxylamine in the presence of ammonia has been demonstrated (Böttcher and Koops 1994, de Brujin et al. 1995).
Reference:
Hollemann-Wiberg (1995): Lehrbuch der Anorganischen Chemie, de Gruyter, p. 702-704
Böttcher B, Koops HP (1994). Growth of lithotrophic ammonia-oxidizing bacteria on hydroxylamine. FEMS Microbiol Lett 122: 263-266
De Brujin P et al.(1995). Growth of Nitrosomonas europaea on hydroxylamine. FEMS Microbiol Lett 125: 179-184
ECB (2008). EU-RAR Draft, Bis-(hydroxylammonium)sulphate, CAS: 10039 -54 -0,14. May 2008
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