Abstract

Hexachlorocycloheranes (HCHs) are the most abundant organochlorine pesticides in the world's oceans and large lakes, and knowing their chemical reactivity is important for determining environmental fate. Hydrolysis of α- and γ-HCHs was carried out in buffered distilled water poisoned with sodium azide in dark, tightly sealed bottles to avoid biodegradation, photolysis, and volatilization losses. Experiments were run at (9) constant temperature (45 o C) and pH 7-9 and (b) constant pH (9) and 5-45 o C over times of 4-248 d, depending on reaction conditions. At constant pH, breakdonvn of the HCHs followed pseudofirst-order kinetics

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