Abstract:

A method using gas chromatography (GC) was presented for simultaneous determination of captan, folpet and captafol residues in vegetable. Samples were extracted with acetone and subjected to liquid-liquid extraction with n-hexane, followed by cleanup with column filled with florisil and graphitized carbon black. Finally the samples were determined by GC equipped with an electron capture detector (ECD). The limits of quantification for captan, folpet and captafol by this method were 0.005, 0.003 and 0.01 mg/kg, respectively. The average recoveries for these pesticides in cabbage, radish and eggplant spiked at 0.01, 0.05 and 0.1 mg/kg were 71.6%－100.2%, 78.6%－104.6% and 70.2%－86.9%, respectively, and the coefficients of variation were 8.5% － 12.9%, 5.1%－ 11.2% and 8.7%－ 13.6%, respectively (n = 5).

Key words: vegetable, captan, folpet, captafol, gas chromatography