Transformation of metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-l-methylethyl)-acetamide] was studied with an actinomycete strain isolated from metolachlor-contaminated soil. Eight metabolites were obtained and identified by mass and NMR spectral analysis. Benzylic hydroxylation of the aralkyl side chains and/or demethylation a t the N-alkyl substituent appeared to be the only transformations involved. All metabolites had a monochlorine isotopic pattern, indicating that no dehalogenation of the chloroacetyl moiety occurred.

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An analytical technique for analysis of dimethyl tetrachloroterephthalate herbicide and two degradates (monomethyl tetrachloroterephthalate and tetrachloroterephthalic acid) residues in turfgrass thatch and soil has been developed. It involves solid-phase extraction/purification and final gas-liquid chromatographic determination with electron capture detection. The degradates are determined as ethyl esters.The method is sensitive for dimethyl tetrachloroterephth-1 Present address: Instytut Ochrony Roslin,