Abstract
A simplified and sensitive method for the analysis of eight carbamate insecticide residues in foliage, forest soil and fish tissue by direct gas—liquid chromatography (GLC) is described. After fortification, the carbamate residues were extraced from the natural substrates by homogenization in ethyl acetate. The interfering co-extractives present in the crude extracts were removed by filtration through Whatman GF/A glass microfibre filters after coagulation. The carbamate residues were re-extracted into dichloromthane and directly analyzed intact by GLC with a Tracor Model 702 nitrogen—phosphorus detector. The rate of recovery for aminocarb, carbofuran, carbaryl, methomyl, mexacarbate, pirimicarb and propoxur was better than 80% at 5.0-ppm and 0.50-ppm levels. Slightly less than 60% was recovered for methiocarb.
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