Registration Dossier
Registration Dossier
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EC number: 236-690-7 | CAS number: 13464-97-6
Endpoint summary
Administrative data
Description of key information
Additional information
The data required for the stability of hydrazine mono-nitrate are for its hydrolysis. However, no data on hydrolysis were located for hydrazine mono-nitrate, or for any of the read-across substances i.e. hydrazine, hydrazine sulphate or hydrazine hydrate. However, due to reported rapid degradation of hydrazine it is not considered necessary to further test for the hydrolysis endpoint.
In water, under alkaline conditions hydrazine undergoes auto-oxidation by dissolved oxygen, hydrogen peroxide being an important intermediate (IPCS, 1987). In water, oxidation and biodegradation are the main degradation pathways (ATSDR, 1997). The reaction of hydrazine with dissolved oxygen is catalysed by metal ions, particularly copper (ATSDR, 1997). The rate of this reaction is strongly affected by pH; occurring more rapidly under alkaline conditions. Hydrazine was reported to be removed rapidly from polluted waters, with less than one-third of the initial concentration remaining in dirty river water after 2 hours (ATSDR, 1997). In pond or chlorinated, filtered county water, >90% of the initial hydrazine concentration was degraded after 1 day. However, in chlorinated, filtered and softened city water almost the entire initial concentration of hydrazine remained after 4 days. These studies demonstrate the importance of organic matter in the water and hardness of the water in the rate of hydrazine degradation (ATSDR, 1997). At low concentrations, biodegradation may also contribute significantly to the removal of hydrazine (ATSDR, 1997).
It is also important to note that no environmental monitoring data has been located for hydrazine. Due to hydrazine’s rapid degradation it would not be expected to be present in surface waters at measurable concentrations (ATSDR, 1997; IPCS, 1987).
References
ATSDR (1997). Toxicological Profile for Hydrazones. US Department of Health and Human Services. Public Health Service. Agency for Toxic Substances and Disease Registry (ATSDR). Available from: http://www.atsdr.cdc.gov/ToxProfiles/tp100.pdf
IPCS (1987). Environmental Health Criteria 68: Hydrazine. International Programme on Chemical Safety (IPCS). United Nations Environment Programme, International Labour Organisation, World Health Organization. Available from: http://www.inchem.org/documents/ehc/ehc/ehc68.htm
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