The microbial degradation and sorption of carbaryl, malathion, butoxyethyl ester of 2,4-dichlorophenoxyacetic acid (2,4-DBE), methoxychlor, atrazine, diazinon, captan, parathion, and toxaphene were investigated. Malathion and 2,4-DBE were found to undergo transformation readily in both bacterial and fungal cultures. Degradation of malathion and 2,4-DBE at low concentrations (< 1mg/l) in batch cultures of bacteria followed second-order kinetics as predicted by the Michaelis-Menten theory. A single isomer, beta-monoacid of malathion, was the primary metabolite in transformation of malathion by both bacterial and fungal populations. The major metabolite found in 2,4-DBE studies was 2,4-D. Carbaryl underwent chemical hydrolysis to alpha-naphthal in both heterogeneous bacterial cultures and uninoculated controls. In the cultures alpha-naphthol was metabolized to 1,4-naphthoquinone and two unidentified compounds. Bacterial degradation of methoxychlor was slower than bacterial degradation of malathion or 2,4-DBE. The insecticide was metabolized to methoxychlor-DDE. Rapid and extensive sorption of pesticides to fungi, bacteria, and algae was observed with methoxychlor and toxaphene, but with any of the other pesticides investigated.

"March 1975." Includes bibliographical references (pages 40-44).

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