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

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3.0～7.2μg·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。

Contents of 8 organophosphorus pesticides in soil were determined by GC. The sample was dispersed with water and extracted with mixed solvent of acetone-diehloromethane （1＋4） at 60 ℃ for 5 mirk 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.--7.2μg ·^-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%.