Gas-liquid chromatographic method for determining oxamyl in peppers, tomatoes, and cucumbers

A simple and fast gas-liquid chromatographic method has been developed to determine residues of oxamyl insecticide in peppers, tomatoes, and cucumbers. Following sample extraction with ethyl acetate and cleanup on an alumina column, the compound is determined using a thermionic nitrogen-phosphorus detector. The limit of detection is 0.02 ppm based on 40 g sample. Average recoveries for oxamyl at 0.025-1.0 ppm for all 3 products were 88-97%.