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COMETABOLISM OF LOW CONCENTRATIONS OF PROPACHLOR, ALACHLOR, AND CYCLOATE IN SEWAGE AND LAKE WATER
Citation:
Novick, N. AND M. Alexander. COMETABOLISM OF LOW CONCENTRATIONS OF PROPACHLOR, ALACHLOR, AND CYCLOATE IN SEWAGE AND LAKE WATER. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-85/078 (NTIS PB85237691), 1985.
Description:
Low concentrations of propachlor (2-chloro-N-isopropylacetanilide) and alachlor (2-chlor-2', 6'-diethyl-N-(methoxymethyl)acetanilide) were not mineralized, cycloate (S-ethyl-N-ethylthiocyclohexanecarbamate) was slowly or not mineralized, and aniline and cyclohexylamine were readily mineralized in sewage and lake water. Propachlor, alachlor, and cycloate were extensively metabolized, but the products were organic. Little conversion of propachlor and alachlor was evident in sterilized sewage or lake water. The cometabolism of propachlor was essentially linear with time in lake water and was well fit by zero-order kinetics in short periods and by first-order kinetics in longer periods in sewage. The data indicated that cometabolism of these pesticides takes place at concentrations of synthetic compounds that commonly occur in natural waters.