Gas chromatographic determination of airborne residues of azinphosmethyl and azinphosmethyl-oxon by cool on-column injection

Gas chromatographic determination of azinphosmethyl and its thermally labile metabolite, azinphosmethyl-oxon, can be achieved with cool on-column injection and element-specific flame photometric detection. This paper presents a method of analysis for airborne residues of azinphosmethyl and azinphosmethyl-oxon in XAD-4 resin extracts using cool on-column injection. Calculated limits of quantitation for the analytical method are 8.1 ng/m(3) for azinphosmethyl and 10.2 ng/m(3) for azinphosmethyl-oxon. Average percentage recovery and percentage relative standard deviations for 10 replicates were 93+/-18% for azinphosmethyl and 104+/-16% for the oxon. This analytical method is rapid, robust and requires a minimum of gas chromatograph injection port maintenance. (C) 1997 Elsevier Science B.V.