Electrochemical control of solid phase micro-extraction using unique conducting polymer coated fibers

Thompson P. Gbatu, Ozcan Ceylan, K. Sutton, J. F. Rubinson, J. Caruso, H. B. Mark
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引用次数: 78

Abstract

The use of a solid phase micro-extraction (SPME) method with poly(3-methylthiophene) coated platinum micro-fiber electrodes to extract arsenate ions from aqueous solutions without derivatization is described. The fibers were fabricated by cycling the working electrode between –0.20 and +1.7 V (vs. Ag/AgCl) in an acetonitrile solution containing 50 mM 3-methylthiophene monomer and 75 mM tetrabutylammonium tetrafluoroborate (TBATFB) electrolyte. All electrochemical procedures (extraction and expulsion) were conducted in a three-electrode system. After fabrication, the conducting polymer film was immersed in the sample solution and converted to its oxidized, positively charged form by applying a constant potential of +1.2 V with respect to Ag/AgCl reference electrode. Arsenate ions migrated into the film to maintain electroneutrality. Upon subsequent reversal of the potential to –0.60 V vs. Ag/AgCl, the polymer film was converted to its reduced, neutral form and the arsenate ions were expelled into a smaller volume (200 µL) of de-ionized water for analysis using flow injection with inductively coupled plasma mass spectrometric (ICP-MS) detection.
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独特导电聚合物包覆纤维固相微萃取的电化学控制
本文描述了利用聚(3-甲基噻吩)包覆铂微纤维电极的固相微萃取(SPME)方法从水溶液中无衍生化提取砷酸盐。在含有50 mM 3-甲基噻吩单体和75 mM四氟硼酸四丁基铵(TBATFB)电解质的乙腈溶液中,工作电极在-0.20和+1.7 V (vs. Ag/AgCl)之间循环制备纤维。所有的电化学过程(萃取和排出)都在三电极系统中进行。制作完成后,将导电聚合物薄膜浸入样品溶液中,通过对Ag/AgCl参比电极施加+1.2 V的恒定电位,将其转化为氧化的正电荷形式。砷离子迁移到薄膜中以保持电中性。在随后的电位反转到-0.60 V /Ag /AgCl后,聚合物薄膜转化为还原的中性形式,砷酸盐离子被排出到较小体积(200µL)的去离子水中,使用流动注射电感耦合等离子体质谱(ICP-MS)检测进行分析。
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