Analytical methods for the determination of dialifos residue in agricultural products.

A method using gas chromatography (GC) was developed to determine insecticide dialifos in agricultural products, Dialifos were extracted with acetone, the filtrate was evaporated to 50 mt and mixed with 50 mt of petroleum ether; the mixture was then extracted with dichlormathane twice. The extracts were evaporated to dry, dissolved in acetone, and then determined by gas chromatography equipped with a flame photometric detector (FPD) and a DB-1 capillary column, Recovery studies were carried out by spiking the standard dialifos at the levels of 0.05 similar to 0.15, 0.5 similar to 1.5 and 0.5 similar to 1.5 ppm to rice, citrus fruit and kiwi fruit, respectively. Average recoveries were 88.5 similar to 93.4%, 94.4 similar to 97.0% and 93.0 similar to 99.7% and the detection limits were 0.01, 0.05 and 0.05 ppm, respectively. No residue of dialifos was detected in agricultural products which were sampled from traditional markets.