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An Electropolymerized Pyrrole-based Coating for stir bar sorptive extraction of Btex from Water Followed by Gas Chromatography-Mass Spectrometry

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Chinese Journal of Chemistry 2012年第3期30卷 557-562页

作者： Babanezhad, Esmaeil Mirabi, Ali Ghodrati, Roghoieh Department of Chemistry Islamic Azad University Qaemshahr Branch Qaemshahr Iran

A stir bar sorptive extraction （SBSE） technique was developed by the use of polypyrrole （PPy） sorbent, electropolymerized on the surface of a rod, as a possible alternative to solid-phase microextraction （SPME）. Liquid desorption was subsequently employed to transfer the extracted analytes into the injection port of a gas chromatogra- phy-mass spectrometry （GC-MS）. The PPy sorbent including polypyrrole-dodecyl sulfate （PPy-DS） was deposited on the surface of a stainless steel rod from the corresponding aqueous electrolyte by applying a constant deposition potential. The developed method was applied to the trace level extraction of BTEX （benzene, toluene, ethylbenzene, o,p-xylene） from aqueous sample. Optimization of influential experimental conditions including the voltage of power supply, the time of PPy electrodeposition, the extraction temperature, the ionic strength and the extraction time were also investigated. The detection limits of the method under optimized conditions were in the range of 0.01-0.1 ***^-1. The relative standard deviations （RSD） at a concentration level of 1 ***^-1 were obtained between 8% and 13% （n=6）. The calibration curves of BTEX showed linearity in the range of 0.03 to 600 ngomL 1. The proposed method was successfully applied to the extraction of some selected BTEX from river water samples and the relative recoveries were higher than 90% for all the analytes.

关键词： water analysis environmental analysis stir bar sorptive extraction polypyrrole BTEX GC-MS

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Metsulfuron-methyl Molecularly Imprinted stir bar sorptive extraction Coupled with High Performance Liquid Chromatography for Trace Sulfonylurea Herbicides Analysis in Complex Samples

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Chemical Research in Chinese Universities 2012年第4期28卷 594-599页

作者： XU Zhi-gang DU Zhuo LIAN Hai-xian HU Yu-ling LI Gong-ke School of Chemistry and Chemical Engineering Sun Yat-sen UniversityGuangzhou 510275P.R.China

Metsulfuron-methyl molecularly imprinted polymer（MIP）-coated stir bar was prepared for sorptive extraction of sulfonylurea herbicides in complex *** MIP-coating was about 21.3 μm thickness with the relative standard deviation（RSD） of 4.4%（n=10）.It was homogeneous and porous with good thermal stability and chemical *** extraction capability of the MIP-coating was 2.8 times over that of the non-imprinted polymer（NIP）-coating in *** MIP-coating exhibited selective adsorption ability to the template and its *** extraction conditions,including extraction solvent,desorption solvent,extraction time,desorption time and stirring speed,were optimized.A method for the determination of six sulfonylurea herbicides by MIP-coated stir bar sorptive extraction coupled with high performance liquid chromatography（HPLC） was *** linear range was 10―200 μg/L and the detection limits were within a range of 2.0―3.3 μg/*** was also applied to the analysis of sulfonylurea herbicides in spiked river water,soil and rice samples.

关键词： Molecularly imprinted polymer Metsulfuron-methyl stir bar sorptive extraction Coating Sulfonylurea herbicide

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