Gas Chromatographic Determination of Captan, Folpet, and Captafol Residues in Tomatoes, Cucumbers, and Apples Using a Wide-Bore Capillary Column: Interlaboratory Study

Abstract

An interlaboratory study of the determination of captan, folpet, and captafol in tomatoes, cucumbers, and apples was conducted by 4 laboratories using wide-bore capillary column gas chromatography with electron capture detection. The 3 fungicides were determined using the Luke et al. multlresidue method modified to Include additional solvent elutlon in the optional Florisll column cleanup step used with this method. The crops were fortified with each fungicide at 3 levels per crop. Mean recoveries ranged from 86.2% for a 25.1 ppm level of captan in apples to 115.4% for a 0.288 ppm level of captafol In apples. Interlaboratory coefficients of variation ranged from 3.4% (24.7 ppm folpet) to 9.7% (0.243 ppm captafol) for tomatoes; from 2.8% (2.0 ppm captafol) to 8.2% (24.8 ppm captan) for cucumbers; and from 1.5% (0.234 ppm folpet) to 22.1% (0.266 ppm captafol) for apples.

Captan Utilization by a Soil Bacterium Planomicrobium flavidum Strain EF

“…For level 1, flow rate is 20°C/min, temperature is 150°C and time is 0 min. For level 2, flow rate is 6°C/min, temperature is 270°C and time is 15 min (Angioni et al 2003;Gilvydis & Walters 1991).…”

Bacterial Degradation of Fungicide Captan

“…The phthalimide fungicides such as captan, captafol, and folpet are the important surface protectants used to control plant pathogenic fungi , . Captan ( N -trichloromethylthio-4-cyclohexene-1,2-dicarboximide) is one of the most widely used surface fungicides to inhibit the growth of fungi on seeds, fruits, vegetables, and ornamental plants − . Captan is used as an agricultural fungicide to control diseases caused by Botrytis , Fusarium , Fusicoccum , Pythium , and other fungal species .…”