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
Calculated distributions of substances in air-water or in a “unit world” are only applicable as long as the test substance is stable enough to reach equilibrium. The following calculations of these distributions do not consider the hydrolysis of dimethyl phosphonate.
Calculated Koc values of 2.53 (based on log Kow) and 3.71 (based on MCI) indicate a very low sorption potential of dimethyl phosphonate to soil organic matter (Lanxess, 2010).
The calculated Henry’s law constants of 0.33 Pa-m3/mol for dimethyl phosphonate and 0.001 Pa-m3/mol for monomethyl phosphonate indicate a low to moderate potential for volatilization from surface waters (Bayer AG, 2003; Lanxess, 2010).
According to the Mackay Fugacity Model Level I, the main target compartment for dimethyl phosphonate in a “unit world” is water with 95%. The remaining 5% of dimethyl phosphonate will be released into the air (Bayer AG, 2003). Since the water solubility of the degradation product monomethyl phosphonate is about one order of magnitude higher and the vapour pressure one order of magnitude lower, it can be assumed that the exclusive target compartment according to the Mackay Fugacity Model Level I is water.
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