Rapid Determination of Pesticide Residues in Wines by GC-ECD with Large-Volume Injection System

Abstract

A rapid analytical method for 6 pesticides (vinclozolin, procymidone, iprodione, captan, captafol, bromopropylate) and a metabolite of iprodione in wines is described. The analytical procedure requires only sample extraction with a C18 solid-phase extraction (SPE) disk cartridge, followed by a clean-up step through a Florisil cartridge. The same elution solvent was used for both SPE procedures in order to eliminate the step of solvent concentration. The determination of pesticide residues was performed by GC-ECD using a large-volume injection system with a programmable temperature vaporizer (PTV). Limits of quantitation were 0.25 ng/g for vinclozolin, captan and bromopropylate, 0.5 ng/g for procymidone and captafol, and 1.0 ng/g for iprodione and its metabolite. The recoveries at levels of two and twenty times the limits of quantitation were 76.7∼124.3%. This method was applied to determine these pesticides in 15 wines. Dicarboxyimide fungicides such as vinclozolin, procymidone and iprodione were detected in 9 samples.