• Szeto, S. Y.
  Forest Pest Managment Institute, Canadian Forestry Service, Environment Canada.
  
• Sundaram, K. M. S.
  Forest Pest Managment Institute, Canadian Forestry Service, Environment Canada.
  

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 extracted from the natural substrates by homogenization in ethylacetate. 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 dichloromethane and directly analyzed intact by GLC wit 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.