Electrochemically modulated liquid-liquid extraction of ions
Electrochemically modulated liquid-liquid extraction of ions
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DOI：
10.1021/ac051029u
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发表时间：
2005-11-15
影响因子：
7.4
通讯作者：
Arrigan, DWM
中科院分区：
文献类型：
--
作者：
Berduque, A;Sherburn, A;Arrigan, DWM
讨论了在两种不混溶电解质溶液之间的界面处通过电化学进行电化学控制的离子提取方法的发展。一个流体动力学流动注射系统用于恒电位萃取的非氧化还原活性物种从流动的水相到固定的有机凝胶相。离子四乙基铵，4-辛基苯磺酸盐（4-OBSA（-）），和对甲苯磺酸盐（p-TSA（-））作为模型分析物进行了研究。提取研究包括检查提取电位、水相流速和目标物质浓度的影响。提取过程可以通过离子转移电流原位监测，该离子转移电流对于阴离子和阳离子具有相反的符号。从这些实验中获得流体动力学伏安图。显示了从4-OBSA（-）与p-TSA（-）的混合物中选择性萃取4-OBSA（-），以及两种阴离子的共萃取。结果表明，电化学调制的效用，从水相到有机凝胶电解质相的离子的控制提取。这为各种分析过程提供了潜在的好处，包括样品制备和净化。
The development of ion extraction methods under electrochemical control via electrochemistry at the interface between two immiscible electrolyte solutions is discussed. A hydrodynamic flow injection system was used for the potentiostatic extraction of non-redox-active species from a flowing aqueous phase into a stationary organogel phase. The ions tetraethylammonium, 4-octylbenzenesulfonate (4-OBSA(-)), and p-toluenesulfonate (p-TSA(-)) were studied as model analytes. The extraction study comprised examination of the influence of extraction potentials, aqueous-phase flow rate, and target species concentration. The extraction process can be monitored in situ by means of the ion-transfer current, which has opposing signs for anions and cations. Hydrodynamic voltammograms were obtained from these experiments. The selective extraction of 4-OBSA(-), from its mixture with p-TSA(-), as well as coextraction of both anions is shown. The results demonstrate the utility of electrochemical modulation for the controlled extraction of ions from an aqueous phase into an organogel electrolyte phase. This offers potential benefits for various analytical processes including sample preparation and cleanup.