固相萃取-气相色谱法测定水体中29种农药的残留量

Determination of 29 pesticide residues in water by solid phase extraction-gas chromatography

建立了水体中29种农药的固相萃取-气相色谱检测方法。以Envi-18固相萃取小柱提取水样中的各种农药,上样体积为200 mL,洗脱溶剂为正己烷-丙酮(1∶1,体积比)。在添加水平为0.1、1.0和10μg/L时,水样中29种农药的添加回收率为60%～111%,相对标准偏差(RSD)为1.2%～6.4%,方法的检出限(LOD)为5～50 ng/L。所建立方法准确、灵敏、快速,符合水体中多种农药残留检测分析的要求,且对水体中低浓度残留农药的检测效果较好。

A method was developed for the determination of 29 pesticide residues in ground water using the combination of solid phase extraction（SPE） and gas chromatography.Cartridges of Envi-18 were selected for extracting those pesticides and n-hexane-acetone（1：1,V/V） as eluting solvent.The average recoveries of these pesticides at three spiked levels（0.1,1.0 and 10 μg/L） ranged from 60% to 111% with the relative standard deviations（RSD） ranged from 1.2% to 6.4%.The limit of detection（LOD） were from 5 to 50 ng/L.The method is easy,fast and sensitive,which can meet the requirements for simultaneous determination of multi-pesticide residues in water samples.