期刊
JOURNAL OF SEPARATION SCIENCE
卷 34, 期 22, 页码 3231-3239出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201100661
关键词
HPLC; Hollow fiber microporous membrane solid-liquid phase microextraction; Multi-walled carbon nanotube; Organophosphorus pesticides; Water and watermelon samples
资金
- Natural Science Foundations of Hebei [B2010000657]
- Scientific Research Foundation of Education Department of Hebei Province [2009132]
- Excellent Going Abroad Experts Training Program in Hebei Province
A novel method based on simultaneous liquidliquid microextraction and carbon nanotube reinforced hollow fiber microporous membrane solidliquid phase microextraction has been developed for the determination of six organophosphorus pesticides, i.e. isocarbophos, phosmet, parathion-methyl, triazophos, fonofos and phoxim, in water and watermelon samples prior to high-performance liquid chromatography (HPLC). Under the optimum conditions, the method shows a good linearity within a range of 1200?ng/mL for water samples and 5200?ng/g for watermelon samples, with the correlation coefficients (r) varying from 0.9990 to 0.9997 and 0.9986 to 0.9995, respectively. The limits of detection (LODs) were in the range between 0.1 and 0.3?ng/mL for water samples and between 1.0 and 1.5?ng/g for watermelon samples. The recoveries of the method at spiking levels of 5.0 and 50.0?ng/mL for water samples were between 85.4 and 100.8%, and at spiking levels of 5.0 and 50.0?ng/g for watermelon samples, they were between 82.6 and 92.4%, with the relative standard deviations (RSDs) varying from 4.56.9% and 5.27.4%, respectively. The results suggested that the developed method represents a simple, low-cost, high analytes preconcentration and excellent sample cleanup procedure for the determination of organophosphorus pesticides in water and watermelon samples.
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