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For the photochemical oxidative degradation of 2-chlorobenzonitrile an atmospheric half-life of 66 days can be calculated (AOP v1.91).

2-chlorobenzonitrile hydrolyzes in neutral anaerobic sediments with a half-life of approximately 160 days, but biological degradation processes could not totally be excluded in the experiment. The test substance is also transformed by hydrolysis with hydrochloric acid (HCl), caliumhydroxide (KOH), sodiumhydroxid (NaOH) and sulfuric acid (H2SO4). A possible transformation product of basic and acidic hydrolysis is 2-chlorobenzoic acid.

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