| Homogeneous liquid-liquid extraction combined with gas chromatography-electron capture detector for the determination of three pesticide residues in soils. | |
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MedLine Citation:
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PMID: 18558137 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In this study, a new method was developed for analyzing malathion, cypermethrin and lambda-cyhalothrin from soil samples by using homogeneous liquid-liquid extraction (HLLE) and gas chromatography with electron capture detector (GC-ECD). Acetone was used as extraction solvent for the extraction of target pesticides from soil samples. When the extraction process was finished, the target analytes in the extraction solvent were rapidly transferred from the acetone extract to carbon tetrachloride, using HLLE. Under the optimum conditions, linearity was obtained in the range of 0.05-40 microg kg(-1) for malathion, 0.04-10 microg kg(-1) for lambda-cyhalothrin and 0.05-50 microg kg(-1) for cypermethrin, respectively. Coefficients of correlation (r(2)) ranged from 0.9993 to 0.9998. The repeatability was carried out by spiking soil samples at concentration levels of 2.5 microg kg(-1) for lambda-cyhalothrin, and 10 microg kg(-1) for malathion and cypermethrin, respectively. The relative standard deviations (RSDs) varied between 2.3 and 9.6% (n=3). The limits of detection (LODs), based on signal-to-noise ratio (S/N) of 3, varied between 0.01 and 0.04 microg kg(-1). The relative recoveries of three pesticides from soil A1, A2 and A3 at spiking levels of 2.5, 5 and 10 microg kg(-1) were in the range of 82.20-91.60%, 88.90-110.5% and 77.10-98.50%, respectively. In conclusion, the proposed method can be successfully applied for the determination of target pesticide residues in real soil samples. |
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Authors:
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Xuedong Wang; Xinna Zhao; Xiujuan Liu; Yanyan Li; Lingyan Fu; Jia Hu; Changjiang Huang |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-05-20 |
Journal Detail:
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Title: Analytica chimica acta Volume: 620 ISSN: 1873-4324 ISO Abbreviation: Anal. Chim. Acta Publication Date: 2008 Jul |
Date Detail:
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Created Date: 2008-06-18 Completed Date: 2008-07-17 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0370534 Medline TA: Anal Chim Acta Country: Netherlands |
Other Details:
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Languages: eng Pagination: 162-9 Citation Subset: IM |
Affiliation:
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School of Environmental Science and Public Health, Wenzhou Medical College, Wenzhou 325035, China. zjuwxd@yahoo.com.cn |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Carbon Tetrachloride Chromatography, Gas / methods* Electrons* Molecular Structure Organic Chemicals / chemistry Pesticide Residues / analysis*, chemistry* Soil / analysis* Solvents / chemistry |
| Chemical | |
Reg. No./Substance:
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0/Organic Chemicals; 0/Pesticide Residues; 0/Soil; 0/Solvents; 56-23-5/Carbon Tetrachloride |
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