水样中几种酰胺类除草剂的SPE-GC/ECD法检测  

Method for detection of acetanilide herbicide residues in water sample by SPE-GC/ECD

作　　者：陈虹[1] 韩勇[1] 钟明[1] 靳伟[1] 王曦[1] 陆国兴[1] 孙晓丽[1] 倪俊[1] 

机构地区：[1]中国科学院南京土壤研究所土壤与环境分析测试中心,江苏南京210008

出　　处：《化学试剂》2010年第4期325-327,344,共4页Chemical Reagents

基　　金：中国科学院南京土壤研究所所基金支撑课题(20752010028)

摘　　要：采用固相萃取-气相色谱/电子捕获检测法(SPE-GC/ECD)对水样中的几种酰胺类除草剂(含两种三嗪类除草剂)进行了残留量检测。并对实验过程中涉及的一系列条件进行了优化,结果表明:C18小柱经5mL甲醇-5mL水活化后,将样品以约4～5mL/min的速率过柱富集;再用13～15mL丙酮、以约0.4～0.5mL/min的速率进行洗脱,洗脱液旋转蒸发浓缩N2吹除水后用正己烷定容后上机测定,结果良好,符合有机分析要求。仪器的检出限为0.003～0.056mg/L。Several kinds of acetanilide herbicide residues in water sample were detected by SPE-GC/ECD（solid phase extraction-gas chromatography/electron capture detector）.Correlative test conditions were optimized during experimentation.The results showed that the said SPE-GC/ECD method was an appropriate one for detecting acetanilide herbicide residues in water sample under the following conditions：The SPE C18 column was activated by injecting 5 mL of methanol-5 mL of ultra-pure water;then the water sample was routed through the C18 column at a rate of 4～5 mL/min in order to retain the target compounds in the column;and then 13～15 mL of acetone passed through the column at a rate of 0.4～0.5 mL/min for desorption of target compounds;finally,the washing solution was concentrated and purged by nitrogen until being approximately dry,and then was diluted to a constant volume with hexane prior to detection by GC/ECD.The detection limits of these acetanilide herbicides on GC/ECD varied from 0.003～0.056 mg/L.

关 键 词：水样 酰胺类除草剂 残留量 检测 

分 类 号：O657.7[理学—分析化学]