Registration Dossier
Registration Dossier
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EC number: 212-783-8 | CAS number: 868-85-9
Endpoint summary
Administrative data
Description of key information
Additional information
Dimethyl phosphonate is rapidly degraded in air with a half-life of 2.9 days (Bayer AG, 2003; Currenta, 2008).
The main degradation process in water is hydrolysis. Depending on the pH the substance is hydrolysed rapidly to moderately fast. At higher pH values hydrolysis is much faster than at lower pH values (Bayer AG, 2002).
Dimethyl phosphonate is not readily biodegradable. After an exposure period of 28 days a biodegradation of about 50% was found (Bayer AG, 1992; MITI, 1992).
Based on a calculated log Kow value of -1.13 dimethyl phosphonate is judged to be non-bioaccumulative.
According to EPI Suite calculations dimethyl phosphonate is expected to have a very low potential to adsorb to soil organic matter (Koc = 2.53; Lanxess, 2010) and to have a moderate potential for volatilization from surface water (HLC = 0.33 Pa-m³/mole; Bayer AG, 2003). Both findings indicate an accumulation of dimethyl phosphonate in water. Distribution modelling according to the Mackay Fugacity Model Level I supports this assumption. According to Mackay Fugacity Model Level I the main target compartment for dimethyl phosphonate is water with 95% (Bayer AG, 2003).
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