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Agas chromatography method for the determination of residues of 6 pesticides in Isatis indigotica Fort and Paeonia lactiflora Pall is described. Optimizations of different parameters were performed. The method used 0.5 g herb sample, silica gel as thematrix solid-phase dispersion sorbent, and acetone as the eluting solvent. Recoveries at spiked concentrations between 0.1 and 5mg/kg were between 80.63 and 110.12, with relative standard deviations ranging from 0.43 to 17.67. The limits of quantitation were 0.01 mg/kg for metalaxyl, triadimefon, and paclobutrazol and 0.05mg/kg for vinclozolin, tebuconazole, and fenarimol. The method may be useful as a screening protocol for the determination of these pesticides in medicinal herb samples.

journal of aoac international

Matrix Solid-Phase DispersionMicroextraction and Determination of Pesticide Residues in Medicinal Herbs by Gas Chromatography with a Nitrogen-Phosphorus Detector