Registration Dossier
Registration Dossier
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EC number: 240-815-0 | CAS number: 16752-77-5
Endpoint summary
Administrative data
Description of key information
Photochemical degradation in the upper atmosphere is expected to occur with a half-life of 19 hours. Therefore, concentration of methomyl in the air compartment and transport through it is not expected to be significant. In a hydrolysis study, methomyl was unstable at all pH and temperature conditions; however, hydrolysis occurred at a more rapid rate at higher temperatures across the pH range tested. Based on these results, methomyl would be expected to hydrolyze in the environment. Exposure of aqueous test substance solution at concentrations of 10 and 100 ppm to artificial sunlight (peak sensitivity at approximately 365 nm, and intensity equivalent to approximately half that of typical summer sunshine at noon) yielded half-lives of approximately 5.5 and 2 days, respectively. In a photo-transformation study in soil, the test substance decomposed with a half-life of 34 days to form acetonitrile, the only detected radioactive decomposition product.
Additional information
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