Registration Dossier
Registration Dossier
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EC number: 236-690-7 | CAS number: 13464-97-6
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
- Koc at 20 °C:
- 2
Additional information
No specific adsorption/desorption data were located for hydrazine mono-nitrate or any of the read-across substances i.e. hydrazine, hydrazine sulphate and hydrazine hydrate. However, it is not considered necessary to specifically test for adsorption and desorption of hydrazine mono-nitrate, due to the evidence available indicating that hydrazine rapidly undergoes degradation and has low log Kow and Koc values. Hydrazine has an estimated Koc of 2 determined from a log Kow of -2.07 (HSDB, 2010). Both the Koc and log Kow indicate that hydrazine would be highly mobile in soil and unlikely to adsorb to suspended solids and sediment in the aquatic environment. Hydrazine is a weak base with a pKa of 7.96, this indicates that in moist soils and water it will partially exist in the protonated form, which is more likely to adsorb than the free base (HSDB, 2010). However, as discussed in Section 5.1, hydrazine is expected to undergo rapid degradation, therefore it is unlikely to persist for a significant period of time.
References
HSDB (2010). Hazardous Substances Data Bank. Available from:http://toxnet.nlm.nih.gov/cgi-bin/sis/htmlgen?HSDB
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