期刊
MICROCHIMICA ACTA
卷 176, 期 3-4, 页码 367-374出版社
SPRINGER WIEN
DOI: 10.1007/s00604-011-0720-2
关键词
TT-tube extractor; Dynamic hollow fiber, Microextraction; Chlorobenzenes; Gas chromatography, Electron capture detector
We have combined dynamic hollow fiber liquid-phase microextraction with GC and electron capture detection for the quantitative determination of five chlorobenzenes in water samples. Extraction is based on an automated dynamic extraction device called TT-tube extractor which consists of a polypropylene hollow fiber mounted inside a stainless steel tube. Toluene is used as the extraction solvent that fills the lumen and pores of the hydrophobic fiber and flows through the lumen of the fiber using a programmable syringe pump. The type of organic solvent, ionic strength, diameter of the TT-tube, sample volume, and the times for extraction and dwelling were optimized. Under optimum conditions, the method gives limits of detection as low as 10-100 ng L-1, a linear dynamic range of 0.05-100 mu g L-1, and relative standard deviations of < 7% (n = 6). The preconcentration factor can be as large as 562-973. In an example for a practical application, the chlorobenzenes were successfully determined in environmental aqueous samples. The hollow fiber membrane can be used at least 20 times without any carry-over or loss in extraction efficiency. The system is inexpensive and convenient, and requires minimal manual handling.
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