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

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Publication Type thesis
School or College College of Science
Department Chemistry
Author Williams, Jennifer Ann
Title The effects of changing the composition of a mixed mobile phase in electrochemically modulated liquid chromotography
Date 2011-08
Description 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 (?), surface tension (d?), 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.
Type Text
Publisher University of Utah
Subject Electrochemically modulated liquid chromatography; EMCL; Acetonitrile; ACN; Mobile phase; Porous graphite carbon; PGC
Dissertation Institution University of Utah
Dissertation Name Master of Science
Language eng
Rights Management Copyright © Jennifer Ann Williams 2011
Format Medium application/pdf
Format Extent 2,546,991 bytes
Identifier us-etd3,49581
Source Original housed in Marriott Library Special Collections, QD3.5 2011 .W55
ARK ark:/87278/s6fj2xg8
Setname ir_etd
ID 194345
Reference URL https://collections.lib.utah.edu/ark:/87278/s6fj2xg8