Combination of dispersive solid-phase extraction and salting-out homogeneous liquid-liquid extraction for the determination of organophosphorus pesticides in cereal grains
文献类型: 外文期刊
第一作者: Jia, Chunhong
作者: Jia, Chunhong;Zhu, Xiaodan;Zhao, Ercheng;He, Min;Chen, Li;Yu, Pingzhong;Jia, Chunhong;Zhu, Xiaodan;Wang, Jihua;Zhao, Ercheng;He, Min;Chen, Li;Yu, Pingzhong
作者机构:
关键词: Cereals;Dispersive solid-phase extraction;Homogeneous liquid-liquid extraction;Organophosphorus pesticides
期刊名称:JOURNAL OF SEPARATION SCIENCE ( 影响因子:3.645; 五年影响因子:2.943 )
ISSN:
年卷期:
页码:
收录情况: SCI
摘要: A new analytical method for the determination of organophosphorus pesticides in cereal samples was developed by combining dispersive SPE (d-SPE) and salting-out homogeneous liquid-liquid extraction (SHLLE). The pesticides were first extracted from cereal grains with acetonitrile, followed by d-SPE cleanup. A 2mL aliquot of the extract was then added to a centrifuge tube containing 9.2 mL water and 3.3 g NaCl for SHLLE. Analysis of the extract was carried out by gas chromatography coupled with flame photometric detection. The d-SPE procedure effectively provides the necessary cleanup of the extract while SHLLE is used as an efficient concentration technique. Experimental parameters influencing the extraction efficiency including amounts of added water and salt were investigated. Recovery studies were carried out at three fortification levels, yielding recoveries in the range of 57.7-98.1% with the RSD from 3.7 to 10.9%. The reported limits of determination obtained from this study were 1 μg/kg, which is better than the conventional methods. In the analysis of 40 wheat and corn samples taken from Beijing suburbs, only two wheat samples have chlorpyrifos residue over the limits of determination.
分类号: O6
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