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Liquid-liquid Microextraction Based on Solidification of floating organic drops Coupled with Gas Chromatography for Analyzing Trace Benzene, Toluene and Xylene in Water Samples

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Chemical Research in Chinese Universities 2011年第6期27卷 939-943页

作者： ZHANG Mao-sheng HUANG Jia-rong ZHENG Xiang-hua XIE Qiong-fang Department of Chemistry and Environmental Science Zhangzhou Normal University Zhangzhou 363000 P. R. China Zhangzhou Entry-Exit Inspection and Quarantine Bureau Zhangzhou 363000 P. R. China Inspection and Quarantine Technical Center Xiamen Entry-Exit Inspection and Quarantine Bureau Xiamen 361012 P. R. China

A new liquid-liquid microextraction method based on the solidification of floating organic drops coupled with gas chromatography was developed for the determination of trace benzene, toluene and xylene（BTX） in water samples. In the microextraction procedure, a microdrop of n-decanol was delivered to the surface of the analytes’ solution, and stirred for a desired time. Following the absolute extraction, the sample vial was cooled in an ice bath for 10 min. The solidified n-decanol was then transferred into a plastic tube and melted naturally; and 1 μL of it was injected into gas chromatography for analysis. Factors relevant to the extraction efficiency were studied and optimized. The optimal experimental conditions were： 15 μL of n-decanol as extractive solvent, 30 mL of solution containing analytes, no salt, the stirring rate 400 r/min, the extraction temperature 30 °C, and the extraction time 30 min. Under those optimized conditions, the detection limit（LOD） of analytes was in a range of 0.05―0.10 ng/mL by the developed method. A good linearity（r0.99） in a calibration range of 0.01―100 μg/mL was obtained. The recoveries of the real samples at different spiked levels of BTX were in the range from 92.2% to 103.4%.

关键词： Gas chromatography Liquid-liquid microextraction solidified floating organic drop n-Decanol

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