Trace determination of organophosphorus pesticides in environmental samples by temperature-controlled ionic liquid dispersive liquid-phase microextraction

被引:246
作者
Zho, Qingxiang [1 ]
Bai, Huahua [1 ]
Xie, Guohong [2 ]
Xiao, Junping [3 ]
机构
[1] Henan Normal Univ, Sch Chem & Environm Sci, Henan Key Lab Environm Pollut Control, Xinxiang 453007, Peoples R China
[2] Henan Inst Sci & Technol, Coll Resources & Environm, Xinxiang 453007, Peoples R China
[3] Univ Sci & Technol Beijing, Dept Chem, Beijing 100083, Peoples R China
关键词
temperature-control led ionic liquid; dispersive liquid-phase microextraction; ionic liquid; methylparathion; phoxim;
D O I
10.1016/j.chroma.2008.02.094
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
This paper described a new approach for the determination of organophosphorus pesticides by temperature-controlled ionic liquid dispersive liquid-phase microextraction prior to high-performance liquid chromatography with ultraviolet detection. Methylparathion and phoxim, two of the typical organophosphorus pesticides, were used as the model analytes for the investigation of the development and application of the new microextraction method. 1-Hexyl-3-methylimidazolium hexafluorophosphate [C6MIM][PF6] was used as the extraction solvent and the factors affecting the extraction efficiency such as the volume Of [C6MIM][PF6], pH of working solutions, extraction time, centrifuging time, dissoluble temperature and salt effect were optimized. Under the optimal extraction conditions, methylparathion and phoxim exhibited good linear relationship in the concentration range of 1-100 ng mL(-1). The detection limits were 0.17 ng mL(-1) and 0.29 ng mL(-1), respectively. Precisions of proposed method (RSDs, n = 6) were 2.5% and 2.7%, respectively. This proposed method was successfully applied in the analysis of four real environmental water samples and good spiked recoveries over the range of 88.2-103.6% were obtained. These results indicated that temperature-controlled ionic liquid dispersive liquid-phase microextraction had excellent application prospect in environmental field. (C) 2008 Elsevier B.V. All rights reserved.
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页码:148 / 153
页数:6
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