期刊
JOURNAL OF SEPARATION SCIENCE
卷 34, 期 7, 页码 837-843出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201000728
关键词
Dispersive liquid-liquid microextraction; Gas chromatography; Organochlorine pesticides; Water sample analysis
资金
- National Science Council of Taiwan [NSC 96-2113-M-007-03-MY3]
In this study, the organochlorine pesticides (OCPs) levels in lake and tap water samples were determined by a dispersive liquid-liquid microextraction method using a low-density organic solvent and an improved solvent collection system (DLLME-ISCS). This method used a very small volume of a solvent of low toxicity (11 mu L of 1-nonanol and 400 mu L of methanol) to extract OCPs from 10 mL water samples prior to the analysis by GC. After centrifugation in the dispersive liquid-liquid microextraction, there was a liquid organic drop floating between the water surface and the glass wall of the centrifuge tube. The liquid organic drop (with some water phase) was transferred into a microtube (3mm x 15 mm) with a syringe. The organic and aqueous phases were separated in the microtube immediately. Then, 1 mu L of the organic solvent (which was in the upper portion of liquid in the microtube) was easily collected by a syringe and injected into the GC-ECD system for the analysis. Under optimum conditions, the linear range of this method was 5-5000 ng/L for most of the analytes. The correlation coefficient was higher than 0.997. Enrichment factors ranged from 1309 to 3629. The relative recoveries ranged from 73 to 119% for lake water samples. The LODs of the method ranged from 0.7 to 9.4 ng/L. The precision of the method ranged from 1.0 to 10.8% for lake water.
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