【作者】 刘伟； 何丽君；

【Author】 LIU Wei,HE Lijun~* (School of Chemistry and Chemical Engineering,Henan University of Technology,Zhengzhou 450001)

【机构】 河南工业大学化学化工学院；

【摘要】 离子液体-分散液液微萃取(ionicliquid-dispersive liquid liquid microextraction,IL-DLLME)结合了DLLME的简单快速及IL的稳定、萃取效果高的优点,已被成功用于各种有机或无机物质的分离富集。本文用含有1-苄基-3-甲基咪唑双三氟甲基磺酰亚胺离子液体的乙腈溶液,在磁力搅拌下,萃取小麦粉中的3种有机氯(2,4-DDE、2,4-DDT和4,4-DDE)。然后将一部分所得提取液加入5 mL二次蒸馏水中进行DLLME,离心后取底部沉积相进行HPLC分析。考察了影响萃取过程的各种因素,在优化条件下,对方法进行了评价。3种有机氯的富集倍数和萃取回收率范围分别是178～188及59.3%～63.5%,线性范围为0.1～100μg/g,RSD(n=5)为1.9%～7.4%,最小检测限(S/N=3)为1 ng/g。将此方法应用于3种不同年份收割的实际小麦样品,3种有机氯的RSD(n=3)和加标回收率范围分别为0.2%～6.5%和95.8%～126.4%。与其它传统萃取方法相比,本方法具有快速,使用溶剂剂量少,操作简便。更多还原

【Abstract】 In this work,three organochlorine pesticides(2,4-DDE,2,4-DDT and 4,4-DDE) in wheat power were analyzed using 1-benzyl-3-methylimidazolium bis[(trifluoromethyl) sulfonyl]imide ionic liquid-dispersive liquid-liquid extraction(IL-DLLME) coupled with HPLC.Experimental conditions affecting DLLME procedure were optimized.Under the optimized conditions,the enrichment factor and extraction recovery were in the range of 178～188 and 59.3%～63.5%,respectively.The linearity range of this method was 0.1～100μg/g with the RSD(n=5) of 1.9%～7.4%,and the detection limit was 1 ng/g.This method was applied to detect three real wheat samples which were harvested in different years,RSD(n=3) and relative recovery were in the range of 0.2%～6.5%and 95.8%～126.4%,respectively.The proposed method is quick,easy to operate and reduce the consumption of organic solvent compared with the conventional sample preparation method.更多还原