Registration Dossier
Registration Dossier
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EC number: 406-250-0 | CAS number: 72619-32-0 HALOXYFOP R-(+)-ME HERBICIDAL CHEMICAL
Endpoint summary
Administrative data
Description of key information
In a photochemical air degradation study using the Atmospheric Oxidation Program, an overall rate constant of 20.89E-12 cm3/molecule-sec was calculated for the test substance at hydroxyl radical concentration of 1.5E6 radicals/cm3 and a 12-hour daylight period. The resultant half-life was calculated to be 6.14 hours. In a hydrolysis study, no degradation was observed at pH 4 at 20°C. The observed half-lives for natural water, pH 7 and 9 buffers were 3 days, 43 days and 0.63 days, respectively. In natural water, pH 7 and 9 buffers, the test substance hydrolyzed to haloxyfop-R acid, which was then observed to be stable. In a phototransformation in water study, In pH 5 buffer, the expected half-life for the test substance was 20 and DT90 value was 66 days. Degradation was faster in natural water with DT50 value of 2 days and DT90 value of 7 days. The quantum yield value was 3.8E-3. Results indicate that in aqueous environments it is likely that the test substance will be photodegraded to form small naturally occurring organic acids and CO2. The test substance was stable to soil photolysis
Additional information
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