Abstract
The requirement to confirm the identity of pesticide residues in the nanogram or picogram range is becoming increasingly important in environmental studies (McCULLY 1969). Various methods have been employed including thin layer chromatography (KOVACS 1963, MINYARD and JACKSON 1965); extraction p-values (BOWMAN and BEROZA 1965); gas chromatography mass spectrometry combination (DAMICO et al. 1970) and multiple gas-liquid chromatography column methods (FAHEY and SCHECTER 1961). Chemical derivative formation followed by electron capture gas chromatography has been employed in a number of laboratories performing routine analyses and has found wide acceptance (McCULLY 1969, WOODHAM et al. 1972; COCHRANE and CHAU 1970). The latter has the advantage of being convenient and sensitive. The identification of organophosphorus insecticides can be made more specific by the use of a flame photometric or an alkali flame ionisation detector rather than an electron capture detector. Even so, the response of these detectors is not unequivocal evidence for the presence of a specific insecticide (ASKEW et al. 1969, GIUFFRIDA 1964, BRODY and CHANEY 1966).
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