加速溶剂萃取-气相色谱测定土壤中有机磷农药

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

摘要: 提出了气相色谱法测定土壤中8种有机磷农药含量的方法。样品以水为分散剂、丙酮-二氯甲烷(1+4)混合溶剂为萃取剂,经加速溶剂萃取仪在60 ℃静态萃取5 min。采用DB17色谱柱分离,火焰光度检测器测定有机磷农药。8种有机磷农药的检出限(3S/N)在3.0~7.2 μg·L-1之间。以土壤样品为基体,进行加标回收试验,回收率在73.3%~110%之间,相对标准偏差(n=7)在5.9%~15%之间。

Abstract: 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%.