Citation: LIANG Xiao-Dan, ZHAO Fa-Qiong, MA Yu-Yu, ZENG Bai-Zhao. Electrochemical Preparation of Polypyrrole-Ionic Liquid Coating for Solid Phase Microextraction and Its Application in Gas Chromatographic Determination of Benzene Derivatives[J]. Chinese Journal of Analytical Chemistry, ;2012, 40(10): 1579-1583. doi: 10.3724/SP.J.1096.2012.11380 shu

Electrochemical Preparation of Polypyrrole-Ionic Liquid Coating for Solid Phase Microextraction and Its Application in Gas Chromatographic Determination of Benzene Derivatives

1.
College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China

Corresponding author: ZENG Bai-Zhao,
Received Date: 6 December 2011
Available Online: 28 April 2012
Fund Project: 本文系国家自然科学基金(No.20975078)资助项目 (No.20975078)

A novel polypyrrole-ionic liquid (PPY-IL) film coated steel wire was prepared by electrodeposition in 0.1 mol/L pyrrole+0.1 mol/L p-methyl benzene sulfonate acid+4 g/L 1-butyl-3-methylimidazolium tetrafluoroborate aqueous solution. The PPY-IL coating showed cauliflower structure, with smaller particle size than that of polypyrrole. Taking five benzene derivatives as models, the analytical performance of the resulting fiber was explored. Under the optimized conditions (i.e. extraction temperature: 50 ℃; extraction time: 40 min; stirring rate: 600 r/min; NaCl concentration: 0.2 g/mL), when the benzene derivatives were determined by GC after headspace solid-phase microextraction with the PPY-IL fiber, the linear ranges were 0.6-800 μg/L with correlation coefficients above 0.99. The relative standard deviations (RSD) of chromatographic peak areas were smaller than 4.5% for five successive extraction with single fiber, and the RSDs for fiber-to-fiber were 4.5-12.4% (n＝5) for different benzene derivatives. The fiber also presented good stability and it still had high extraction efficiency after being used for about 150 times; when the temperature was up to 290 ℃ it did not decompose. In comparison with PPY and polydimethylsiloxane fibers, the PPY-IL fiber showed higher extraction capability and durability.
- Polypyrrole,
- Ionic liquid,
- Solid phase microextraction,
- Electrochemical polymerization,
- Benzene derivatives
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