Graduation Semester and Year

2022

Language

English

Document Type

Thesis

Degree Name

Master of Science in Chemistry

Department

Chemistry and Biochemistry

First Advisor

Kevin Schug

Second Advisor

Purnendu Dasgupta

Abstract

Pulsed amperometric detection (PAD) is a well-established technique used for the detection of electroactive compounds following Ion Chromatography (IC). Target analytes, such as carbohydrates and amino acids, typically have no suitable chromophores and are not detectable by suppressed conductivity following IC separation. While direct current (DC) amperometry is simpler, the formation of oxidation products quickly fouls the electrode surface; PAD removes these products extending electrode longevity for up to ~2 weeks of operation. To further extend electrode lifespans, a new strategy is introduced herein using DC amperometry on a sacrificial copper wire anode. The wire face continually dissolves under oxidative conditions while a spring-loaded plunger feeds the wire into a cell so that the interelectrode distance between the wire working electrode (WE) and counter electrode (CE) is maintained. High nanomolar (sub-ppm) limits of detection have been quantified for simple sugars, and with the use of internal standards the electrode has demonstrated virtually no loss of signal over 2 weeks of continual operation.

Keywords

Amperometry, Copper, Continuous

Disciplines

Chemistry | Physical Sciences and Mathematics

Comments

Degree granted by The University of Texas at Arlington

Included in

Chemistry Commons

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