Determination of Carbamate Insecticides in Water by C-18 Solid Phase Extraction and Quantitative HPTLC

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Abstract
N-Methylcarbamate insecticides were extracted from water using solid phase extraction with a C-18 column. The column eluate was chromatographed on a high performance preadsorbent silica gel plate, the pesticides were detected with P-nitrobenzenediazonium fluoborate reagent, and quantification was performed by densitometric scanning. Recoveries of carbaryl, carbofuran, methiocarb, and propoxur at 0.5 to 5 ppm fortification concentrations averaged 96.8% with a range of 82.5 to 112% and an average standard deviation of 7.5% for triplicate determinations.