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The effects of changing the composition of a mixed mobile phase in electrochemically modulated liquid chromatography.

机译:在电化学调制液相色谱中改变混合流动相组成的影响。

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摘要

The research presented in this thesis investigates the effect of the organic modifier, acetonitrile (ACN), as an additive to an aqueous mobile phase on the electrosorption of aromatic sulfonates onto porous graphitic carbon (PGC), as probed by electrochemically modulated liquid chromatography (EMLC). EMLC is a technique that employs a conductive material such as PGC as both the stationary phase and the working electrode. This dual functionality enables the manipulation of chromatographic retention by changing the potential applied to the stationary phase. This change alters the electrosorption process at the solid-liquid interfaces. Previous works have investigated these changes by applying the Gibbs adsorption equation to determine the interfacial excess (Gamma), surface tension (dgamma), and surface charge (qM). This thesis incorporates the Gibbs adsorption equation to evaluate the effect ACN has on the electrosorption of aromatic sulfonates. This study is then followed up by using attenuated total reflection FTIR spectroscopy (ATR-FTIRS) to study the interactions in the mobile phase of this system, which consisted of mixed water:acetonitrile solutions with benzene as the solute and lithium perchlorate (LiClO4 ) as the supporting electrolyte.
机译:本文提出的研究研究了有机改性剂乙腈(ACN)作为水性流动相的添加剂对芳族磺酸盐在多孔石墨碳(PGC)上的电吸附的影响,如电化学调制液相色谱(EMLC) )。 EMLC是一种采用导电材料(例如PGC)作为固定相和工作电极的技术。这种双重功能可以通过改变固定相的电势来控制色谱保留。这种变化改变了固液界面处的电吸附过程。以前的工作已经通过应用吉布斯吸附方程来研究了这些变化,以确定界面过量(Gamma),表面张力(dgamma)和表面电荷(qM)。本文结合了吉布斯吸附方程,评价了乙腈对芳族磺酸盐电吸附的影响。然后使用衰减全反射FTIR光谱仪(ATR-FTIRS)来研究该系统在流动相中的相互作用,该系统由以苯为溶质的水:乙腈混合溶液和以高氯酸锂(LiClO4)为混合液组成。支持电解质。

著录项

  • 作者

    Williams, Jennifer Ann.;

  • 作者单位

    The University of Utah.;

  • 授予单位 The University of Utah.;
  • 学科 Chemistry Analytical.
  • 学位 M.S.
  • 年度 2011
  • 页码 77 p.
  • 总页数 77
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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