A general method for the determination of organophosphorus pesticide residues in river waters and effluents by gas, thin-layer and gel chromatography

Abstract

A general, comprehensive scheme for the extraction of organophosphorus pesticides from river waters and sewage effluents is described. The pesticides, after extraction with chloroform, are determined by gas and thin-layer chromatography. The procedure includes details of an improvement that enables all of the pesticides to be detected on thin-layer chromatoplates with a phosphorus-specific ammonium molybdate spray. The use of gel chromatography on columns of Sephadex LH 20 as an adjunct to identification is also described.