Modified QuEChERS in Combination with Dispersive Liquid-Liquid Microextraction Based on Solidification of the Floating Organic Droplet Method for the Determination of Organophosphorus Pesticides in Milk Samples

文献类型： 外文期刊

第一作者： Liu, Deng-biao

作者： Liu, Deng-biao;Wang, Ya-ru;Yang, Yuan-yuan;Yang, Xiao-yun;Gong, Hao-ru

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期刊名称：JOURNAL OF CHROMATOGRAPHIC SCIENCE （ 影响因子：1.618； 五年影响因子：1.682 ）

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收录情况： SCI

摘要： In this work, a rapid, environment friendly and sensitive method was established for the extraction and analysis of five organophosphorus pesticides (OPPs) (chlorpyrifos, chlorpyrifos-methyl, isocarbophos, malathion and phorate) in milk samples by means of gas chromatography-flame photometric detection. The pesticides were first extracted with acetonitrile from milk samples by using the modified "quick, easy, cheap, effective, rugged, and safe" (QuEChERS) method. No other clean-up was required after extraction. Then the above-mentioned acetonitrile extract was concentrated by using the dispersive liquid-liquid microextraction combined with solidification of floating organic droplets technique. Several factors that could influence the extraction efficiency, such as type of extraction solvent, disperser solvent, volume of extraction and disperser solvent, salt effect, sample pH, and extraction time, were investigated and optimized. As a result, 15 mu L of 1-dodecanol were used as the extractant because of its lower toxicity, 300 mu L methanol was chosen as dispersant and the extraction time was set to 1 min. Under the optimized conditions, good linearity was exhibited from 0.01 to 1.0 mg/L with the correlation coefficients higher than 0.9968. The limits of detection of the five OPPs were ranged in 0.1-0.3 mu g/L, and the limits of quantification were at the range of 0.3-1.0 mu g/L. Moreover, the recoveries of the target analytes from milk samples at spiking levels of 0.01, 0.05 and 0.1 mg/L were between 80.5 and 106.5% with the relative standard deviations varied from 3.6 to 6.3%. This method has been successfully applied to detect OPPs in real milk samples.

分类号： O65

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