【摘 要】
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Microdialysis sampling was investigated as a liquid-phase microextraction in the analysis of pesticide residual in tea water before GC/MS and GC/ECD measurements.Five pesticides, including bromopropyl
【机 构】
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Department of Food Science, Central Taiwan University of Science and Technology, Taichung 406, Taiwa
【出 处】
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DaLian Internationall Symposia and Exhibition on Chromatogra
论文部分内容阅读
Microdialysis sampling was investigated as a liquid-phase microextraction in the analysis of pesticide residual in tea water before GC/MS and GC/ECD measurements.Five pesticides, including bromopropylate, chlorfenapyr, chlorpyrifos, ethion and procymidone in tea water samples, wereenriched in the LPME solvent by diffusing through a hollow fiber membrane under the optimal conditions.After the extraction process of LPME, the extraction solvent was withdrew with micro-syringe plug and then injected into GC/MS and GC/ECD system for separation and determination.Factors affecting the efficiency of hollow-fiber protected LPME, such as extraction solvent, pH of tea samples, salt addition and extraction time, were investigated in detail to obtain an optimum condition.Experimental results indicated that the extraction of 50 mL tea water, with a 17-cm length of membrane fiber and hexane as extraction solvent for 30 min achieved the best extraction efficiency of more than 80% recovery and less than 9% RSD.The real samples were obtained from supermarket, and some of pesticides were measured in the amounts varied from 10.5-92μtg/L.The proposed method provided a simple and rapid procedure to collect pesticides from tea water samples by only using a few organic solvent.
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