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Zhao D.,National Chromatographic Randa Center | Zhao D.,University of Chinese Academy of Sciences | Shen Z.,National Chromatographic Randa Center | Yan X.-H.,National Chromatographic Randa Center | And 3 more authors.
Fenxi Huaxue/ Chinese Journal of Analytical Chemistry | Year: 2013

Based on the membrane pervaporation extraction and microtrap method, a sample pretreatment device for volatile organic compounds in water was constructed and evaluated. The volatile organic compounds (VOCs) in water samples could be extracted, preconcentrated, desorbed thermally, and injected directly into a gas chromatograph automatically. Two kinds of porous hollow fiber membrane materials, polydimethylsiloxane (PDMS) and polyvinylidene fluoride (PVDF), were examined. Extraction parameters, such as extraction temperature, extraction time, and carrier gas flow rate, were investigated by using nine model compounds, including chloroform, 1,2-dichloroethane, carbon tetrachloride, trichloroethylene, tetrachloroethylene, toluene, ethylbenzene, styrene and chlorobenzene. Under the optimum conditions (extraction temperature of 60 °C and concentration time of 30 min with purge gas flow of 8 mL min-1), the detection limits of chlorinated hydrocarbons were in the range of 0.003-0.041 μg L-1, with RSD of 2.7% and 13.0%, using a flame ionization detector. Coefficients of correlation were all above 0.9936. This result demonstrated that this device was feasible for monitoring volatile organic compounds in water. Copyright © 2013, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences. Published by Elsevier Limited. All rights reserved. Source

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