Abstract
A method for the detection of organophosphorous pesticides directly on thin-layer chromatograms is described. One approach involves heating the chromatogram for a definite period of time at a specific temperature. The other requires spraying the chromatopplate with a strong acid or base prior to the heat-treatment. From a total of thirty-five organophosphorous pesticides investigated, twelve gave positive results. Instrumental limits of detection at the nanogram level are possible.
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