GC Determination of Organophosphorus Pesticides in Soil with Accelerated Solvent Extraction of Sample

Contents of 8 organophosphorus pesticides in soil were determined by GC. The sample was dispersed with water and extracted with mixed solvent of acetone-dichloromethane (1+4) at 60 ℃ for 5 min. DB17 column and flame photometric detector were used for separation and determination of the 8 pesticides. Values of detection limit (3S/N) were found in the range of 3.0-7.2 μg·L-1. Using sample of soil as matrixes, test for recovery was made by standard addition method, and values of recovery obtained were in the range of 73.3%-110%, with values of RSD′s (n=7) in the range of 5.9%-15%.