Registration Dossier
Registration Dossier
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EC number: 603-520-1 | CAS number: 131807-57-3
Endpoint summary
Administrative data
Description of key information
In a hydrolysis study, the degradation of the test matial in aqueous solutions at pH 5, 7, and 9 were studied. At pH 9, the test substance was rapidly degraded with a half-life of 1.55 hours (0.0646 day). At pH 7, the half-life was 2 days, and at pH 5, the half-life was 41 days. The degradation rate was inversely proportional to the hydrogen ion [H+] concentration. Several products were identified from the hydrolysis solutions using GC/MS, radio-GC and/or LC/MS. Identified products included IN-MN968, IN-JL856, IN-JS940, IN-H3310, phenol, catechol, and benzene. Polar, organic acid(s) were characterized, based on HPLC retention times and partitioning characteristics.
The photolysis of the test substance was studied in aqueous, buffered solution at pH 5, the most hydrolytically stable pH. An abbreviated experiment was also conducted in natural water (pH 7.75) under non-sterile conditions, both in the light and in darkness. At pH 5, the test substance was degraded with a half-life of 4.6 days (r2 = 0.97) (dark control 41 days, r2 = 0.91) in actual natural sunlight equivalents. In irradiated, non-sterile natural water (pH 7.75), the test substance was rapidly degraded with a half-life of 3.9 hours (dark control 5.0 hours). The major photolytic pathways yielded IN-Н3310, IN-JS940, and IN-KF015 from the phenoxphenyl portion of the test substance. Stable products from the phenylamino portion of the molecule were phenol, polar adds (fumaric, oxalic, and formic), and carbon dioxide.
The Phototransformation in soil study was conducted following US EPA guideline 161-3. The study investigated the effect of simulated sunlight on the route and the rate of degradation of test substance on soil thin layers. Degradation of the test substance on layers of soil irradiated with simulated sunlight was substantially faster than degradation of identical samples under non-irradiated conditions. Under the conditions of this study, the test substance degraded with a calculated average first-order half-life of 4.1 days (11.5 days correlated to natural sunlight) while under nonirradiated conditions the average half-life was greater than 30 days.
Additional information
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