Registration Dossier

Environmental fate & pathways

Hydrolysis

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Link to relevant study record(s)

Description of key information

No specific abiotic hydrolysis studies are available for submission. Vogel and McCarty 1986 (the research paper is included in the biodegradation section of the dossier) while evaluating the ability of anaerobic bacteria to degrade 1,1,1-trichloroethane quote the abiotic hydrolysis to the approximately nine years. The abiotic degradation route is as follows:
1,1,1-Trichloroethane -> 1.1-dichloroethylene + acetic acid -> vinyl chloride -> carbon dioxide.

Key value for chemical safety assessment

Additional information

In the 1996 UK review it is noted that the material is fairly resistant to abiotic hydrolysis with half lives estimated in months rather than days. Contamination of the surface and marine waters is most likely to occur from waste water disposal following use in industrial processes such as metal cleaning. Similarly, contamination of groundwater is thought to occur following leaching from existing unregulated chemical disposal sites. Contamination of water is therefore considered unlikely when used as a transported intermediate as no release should occur. The UK review provides an estimate of the air:water partition coefficient (Kaw) of -0.03 to -0.17 supported by the fact that volatility from a I.0 Molar solution in 30 minutes is 6.1. This indicates that abiotic hydrolysis will be of negligible importance in the removal of this material from the environment.