Report of two co-operative trials of a gel permeation chromatographic method for the isolation of pesticide residues from oils and fats. Committee for Analytical Methods for Residues of Pesticides in Foodstuffs of the Ministry of Agriculture, Fisheries and Food.

Abstract

A gel permeation chromatographic (GPC) method for the determination of pesticide residues in fats and oils was subjected to two co-operative trials. Results for organochlorine pesticides (beta-HCH, gamma-HCH, dieldrin, p,p'-DDE and heptachlor) were compared with those obtained using an alumina column clean-up method. No significant differences in the mean values were found between the two techniques using the t-test (5% significance level). Horrat values demonstrated acceptable inter- and intralaboratory precisions for both clean-up techniques. Two organophosphorus pesticides (diazinon and propetamphos) and the synthetic pyrethroid deltamethrin were also determined using the GPC method. However, these compounds were not recoverable using the alumina column method, so no comparisons between the two methods were possible.