双柱双ECD法测定水中16种有机氯农药

Determination of 16 species of organochlorine pestcides in water by dual-column and dual-μECD gas chromatography

建立了双柱、双ECD法测定水中16种有机氯农药的方法,实验考察了萃取次数、萃取溶剂体积、浓缩方式对测定结果的影响。当水样体积为200mL时,方法检出限为3.0～13.4ng/L,所得各组分的相对标准偏差为2.4%～12%,平均回收率为73.7%～120%。采用双柱、双ECD检测器,在一次进样的条件下,可以同时收集两套数据供定性和定量分析,具有定性更准确、定量更精确的特点。

A new method was established for determining 16 species of organochlorine pestcides in water by dual-column and dual-μECD gas chromatography.The influencing factors such as extracting times,extracting solvent volume and concentration mode were discussed.When the sample volume was 200 mL,the method detection limits were from 3.0 ng/L to 13.4 ng/L,the relative standard deviations were between 2.4% and 12%,and the average recoveries ranged from 73.7% to 120%.Two group of data for qualitative and quantitative analysis of organochlorine pestcides were obtained by one injection of sample,so this method is qualitatively more accurate and quantitatively more exact.