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Title: Part I. Carbon and mercury-carbon optically transparent electrodes. Part II. Investigation of redox properties of technetium by cyclic voltammetry and thin layer spectroelectrochemistry

A carbon optically transparent electrode (C OTE) has been prepared by vapor-deposithing a thin carbon film (150 to 310 A thick) on glass and quartz. Optical transparency is good throughout the ultraviolet-visible region. Electrochemical and spectroelectrochemical measurements were made with ferricyanide and o-tolidine respectively. The C OTE serves as a good substrate for deposition of a thin mercury film to form a mercury film transparent electrode (Hg-C OTE). The Hg-C OTE exhibits electrochemical properties of conventional mercury film electrodes as evidenced by Pb/sup 2 +/ cyclic voltammograms. The Hg-C OTE exhibits electrochemical properties of conventional mercury film electrodes as evidenced by Pb/sup 2 -/ cyclic VOHammograms. The Hg-C OTE enabled the spectrochemical characterization of cysteine oxidation, which was shown to involve the oxidation of mercury to form mercurous cysteinate. An 8080 based microcomputer has been interfaced with a Harrick oscillating mirror rapid scanning uv-visible spectrophotometer. Two different approaches are compared for controlling the galvanometer. The first utilizes the digital hardware on the Harrick processing module to derive the mirror drive waveform, while the second creates the waveform under direct software control. A potentiostat is also interfaced and the system is demonstrated by the spectroelectrochemical determination of the redox potential ofmore » o-tolidine. Redox potentials are also determined for a series of technetium complexes by the spectropotentiostatic technique. These include hexahalogens, ditertiary arsine, and 1,2-bis(diphenylphosphino) ethane complexes of technetium. Transient hexavalent technetium is produced, detected, and characterized in aqueous alkaline media by pulse radiolysis and very fast scan cyclic voltammetry. The lifetime is of the order of milliseconds. This species is potentially useful in the preparation of technetium radiopharmaceuticals.« less
Authors:
Publication Date:
OSTI Identifier:
5555047
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Publisher:
Univ. of Cincinnati,Cincinnati, OH
Research Org:
Cincinnati Univ., OH (USA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; CYSTEINE; ELECTROCHEMISTRY; OXIDATION; ELECTRODES; MATERIALS; PERFORMANCE; TECHNETIUM COMPLEXES; REDOX POTENTIAL; ARSENIC COMPOUNDS; CARBON; GLASS; MERCURY; MICROPROCESSORS; ORGANIC HALOGEN COMPOUNDS; ORGANIC PHOSPHORUS COMPOUNDS; PH VALUE; QUARTZ; RADIOLYSIS; SPECTROPHOTOMETERS; VOLTAMETRY; AMINO ACIDS; CARBOXYLIC ACIDS; CHALCOGENIDES; CHEMICAL RADIATION EFFECTS; CHEMICAL REACTIONS; CHEMISTRY; COMPLEXES; COMPUTERS; DECOMPOSITION; ELECTRONIC CIRCUITS; ELEMENTS; MEASURING INSTRUMENTS; METALS; MICROELECTRONIC CIRCUITS; MINERALS; NONMETALS; ORGANIC ACIDS; ORGANIC COMPOUNDS; ORGANIC SULFUR COMPOUNDS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; RADIATION CHEMISTRY; RADIATION EFFECTS; SILICON COMPOUNDS; SILICON OXIDES; THIOLS; TRANSITION ELEMENT COMPLEXES 400400* -- Electrochemistry; 400201 -- Chemical & Physicochemical Properties; 400702 -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials