EN
A method for the estimation of organophosphorus insecticides IPO-1391 and IPO-1401 and chlorfenwinphos soil residues by gas chromatography was developed. For extraction a mixture of hexane, acetone and chloroform 1:1:3 by volume was used, the extract was cleaned with active carbon and sodium sulphate. Quantitative analysis was performed by Gas Chrom Q on a 3% DC-200 column and the FID detector. Under the described conditions all three tested insecticides can be estimated simultaneously.