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 released into the atmosphere is rapidly degraded by OH-radicals with an estimated half-life of 2.9 days (Bayer AG, 2003; Currenta, 2008).
In water, dimethyl phosphonate is hydrolysed rapidly to moderately fast depending on the pH. At pH 4 the experimentally determined half-life is about 470 h, at pH 7 it is about 3 h, and at pH 9 it is less than 1 minute (Bayer AG, 2002). In a first step dimethyl phosphonate is hydrolysed to monomethyl phosphonate and methanol, followed by hydrolysis of monomethyl phosphonate to phosphonic acid and methanol. Studies revealed that the first hydrolytic step is faster than the second one, hence monomethyl phosphonate remains for a considerably longer period in aqueous solution than dimethyl phosphonate (Bayer AG, 1992).
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