Interdigitated Array Electrodes as Sensors for Copper Species

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Title: Interdigitated Array Electrodes as Sensors for Copper Species
Author: Coughlin, Jessica Urbanik
Advisors: Janet G. Osteryoung, Chair
Edmond F. Bowden, Member
Christopher B. Gorman, Member
Abstract: Recent development of interdigitated array (IDA) electrodes has opened uppossibilities for their design as novel sensors. In this research IDA electrodes havebeen used to study copper because copper is environmentally significant. The goalsof this research include designing a spectroelectrochemical system to studyphotolysis reactions. The photolysis system will use IDA electrodes to obtain rateconstant information for the photolysis of copper-organic species. The second goalis to use IDA electrodes to determine the stability constants of copper corrosionproducts.A spectroelectrochemical experimental apparatus was designed that wouldenable determination of values of rate constants of photochemical reactions forcopper-organic complexes in an agarose gel matrix. These data are useful forenvironmental scientists but are difficult to measure. Novel geometries ofinterdigitated arrays and spectroelectrochemical cells for these experiments havebeen developed.The corrosion of copper in different media has been examined usinginterdigitated array electrodes. A novel experiment using IDA electrodes has been designed to determine the stability constants of copper corrosion products. Forthese experiments, copper was plated onto one lead of the IDA electrode. Whenthis copper lead was anodized, the corrosion product was detected and measuredat the other IDA lead. In the chloride system, where chloride ranged inconcentration from 0.5 to 1.0 M, the stability constant for CuCl2-was found to be log ß2 = (CuCl2-)/(Cu+)(Cl-)² = 5.88 ± 0.03. For the bromide system, where the bromide concentration ranged from 0.05 to 0.10 M, the stability constant for CuBr2-was found to be log ß2 = (CuBr2-)/(Cu+)(Br-)°= 6.17 ± 0.08. These values fall within therange of values reported in the literature. The maleic acid system was also studied,as maleic acid is a common metabolite that might contribute to biocorrosion. Thepreliminary results from these experiments were close to those values found in the literature.
Date: 1998-08-05
Degree: MS
Discipline: Chemistry

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