渔业水质中拟除虫菊酯农药残留的气相色谱分析

Analysis of pyrethroid residues in fishery water by Gas Chromatography

建立渔业水质中七氟菊酯、联苯菊酯、甲氰菊酯、三氟氯氰菊酯、氯菊酯、氟氯氰菊酯、氯氰菊酯、氰戊菊酯、氟胺氰菊酯、溴氰菊酯10种拟除虫菊酯残留的分析方法。样品以石油醚萃取、无水硫酸钠脱水、减压浓缩后用气相色谱-电子捕获检测器(GC-ECD)测定。七氟菊酯在2.5～100ng/mL、其它9种菊酯在5～200ng/mL内线性关系良好(r≥0.9954);0.05μg/L、0.5μg/L、1μg/L添加浓度水平的回收率在73.8%～100.2%之间,相对标准偏差(RSD)为2.53%～10.3%;检出限(LOD)为0.125～2.5ng/L,最低定量限(LOQ)为0.025～0.05μg/L。该方法简单快速、准确可靠,能满足渔业水质拟除虫菊酯污染的检测要求。

A method for determining tefluthrin,bifenthrin,fenpropathrin,cyhalothrin,permethrin,cyfluthrin,cypermethrin,fenvalerate,tau-fluvalinate,deltamethrin residues in fishery water was developed.The pyrethroids were extracted by petroleum ether,dehydrated by anhydrous sodium sulfate,concentrated and then analyzed by gas chromatography with electron capture detector（GC-ECD）.The linear range of tefluthrin was 2.5～100ng/mL and the other nine were 5～200ng/mL（r≥0.9954）.When spiked with 0.05μg/L,0.5μg/L,1μg/L,the average recoveries ranged from 73.8% to 100.2% and their relative standard deviations（RSD）were between 2.53% and 10.3%.The limits of detection（LOD） and limits of quantitation（LOQ） for all pyrethroids were in the range from 0.125～2.5ng/L and 0.025～0.05μg/L separately.This method is simple,reliable and can be applied in the detection of pyrethroid in fishery water.