Studies on an Analytical Method of Carbamate Insecticides Remained in Vegetables and Fruits

Abstract

A procedure was investigated for determining residual amounts of five carbamate insecticides, 3-methylphenyl N-methylcarbamate (MTMC), 2-chlorophenyl N-methylcarbamate (CPMC), 2-sec-buthylphenyl N-methylcarbamate (BPMC), 3, 4-dimethylphenyl N-methylcarbamate (MPMC) and 1-naphthyl N-methylcarbamate (NAC), in vegetables. It consisted of benzene extraction, clean up by flolisil and charcoal columns, and trifluoroacetylation. Trifluoroacetylated carbamates were measured by electron-capture-gaschromatography and could be separated from each other on a 5 feet glass column packed with Gaschrom Q coated with 3.5% OV-17. The method has been used for potato, orange, Chinese cabbage, burdock, loquat, melon cucumber and komatsuna. In vegetables and fruits, the limits of detection Were 0.01ppm for MTMC, CPMC and BPMC, and 0.03ppm for MPMC and NAC.