期刊
FOOD CHEMISTRY
卷 204, 期 -, 页码 289-297出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2016.02.090
关键词
Solid-phase extraction; Dispersive liquid-liquid microextraction; Multi-residue pesticides; Gas chromatography-mass spectrometry; Food sample analysis
资金
- research council of Razi University
- research council of Iranian Research and Development Center for Chemical Industries
In this work, an effective preconcentration method for the extraction and determination of traces of multi-residue pesticides was developed using solid-phase extraction (SPE) coupled with dispersive liquid-liquid microextraction and gas chromatography-mass spectrometry (GC-MS). Variables affecting the performance of both extraction steps such as type and volume of elution and extraction solvents, breakthrough volume, salt addition, extraction time were thoroughly investigated. The proposed method resulted in good linearities (R-2 > 0.9915) over the ranges of 1-10,000 ng kg(-1), limits of detection (LODs) in the range of 0.5-1.0 ng kg(-1) at S/N = 3, and precision of RSD% of <= 11.8. Under optimal conditions, the preconcentration factors were obtained in the range of 2362-10,593 for 100 mL sample solutions. Comparison of the proposed method with other ones demonstrated that SPE-DLLME method provides higher extraction efficiency and larger preconcentration factor for determination of pesticides residues. Further, it is simple, inexpensive, highly sensitive, and can be successfully applied to separation, preconcentration and determination of the pesticides (and other noxious materials) in different real food samples. (C) 2016 Elsevier Ltd. All rights reserved.
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