气相色谱法测定水样中六六六和滴滴涕残留量

Determination of HCH and DDT in Water by Gas Chromatography

采用液液萃取的方法将水样中残留的六六六、滴滴涕转移到乙腈中,经浓缩后用双毛细管柱、双电子捕获检测器进行测定。实验结果表明,利用DB-17毛细管柱,在0.005~1.07μg/L添加水平下,六六六、滴滴涕8种同分异构体的平均回收率为82.1%~109%,相对标准偏差为0.23%~9.8%,方法检出限为0.001~0.03μg/L。方法具有试剂用量少,操作简单、快速,灵敏度、准确度和精密度高等优点,有实用价值。

Multi-residues of HCH and DlYr pesticide in water were extracted by acotonitrile, and detected by double capillary columns and double electron-capture detectors. The results showed that,using DB-17 capillary column, the.avernge recovery ratio of HCH and DDT was 82. 1% - 109 % at spiked level of 0.005 - 1.07μL, and relative standard deviation （ RSD ） was 0.23 % - 9.8 %, and the method de- tection limit was 0.001 -0.03 μs/L. The method has the merits of simple, convenient, less reagent dosage, high accuracy and precision.