VOLTAMMETRIC STUDIES WITH THE GRAPHITE INDICATING ELECTRODE
In preparation for use of the graphite electrode in chronopotentiometry, automatically recorded currentpotential curves obtained with it were further evaluated by studying a variety of inorganic and organic reversible and irreversible systems. In mineral acid solutions penetration of the solution into wax-impregnated graphite resulted in poor reproducibility. Satisfactory results are obtained in slightly acidic and neutral media; alkaline media were not investigated. Experimental conditions must be carefully controlled for good results. The reductions of silver(I) and mercury(II) are comparable to those obtained with the platinum electrode; iron(III) gave poor resuls. Results with the quinone- hydroquinone system were good, except that E/sub 1/2/ for the oxidation and reduction processes did not coincide. Oxidation studies of the three isomeric Phenylenediamines and the three isomeric dihydroxybenzenes at pH 5.5 were satisfactory. The o- and pphenylenediamines undergo 2e oxidation, the latter showing semiquinone formation; the meta shows a 1e wave due apparently to the formation of a free radical which polymerizes. Hydroquinone and catechol show the same 2e oxidation; the meta isomer, resorcinol, apparently oxidizes to a free radical which polymerizes to a film that coats the electrode. (auth)
- Research Organization:
- Univ. of Michigan, Ann Arbor
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-13-001145
- OSTI ID:
- 4328679
- Journal Information:
- Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed., Journal Name: Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed. Vol. Vol: 30; ISSN ANCHA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
Similar Records
The surface characterization of a series of hydroxybenzenes on Ag(111): An EELS and TDS study
The surface characterization of a series of hydroxybenzenes on Ag(111): An EELS and TDS study
Related Subjects
AMINES
CATECHOL
CHEMICAL REACTIONS
CHEMISTRY
COMPOUNDS
CURRENTS
DIAGRAMS
ELECTRIC POTENTIAL
ELECTROCHEMISTRY
ELECTRODES
FILMS
FREE RADICALS
GRAPHITE
HYDROXIDES
IMPREGNATION
IRON COMPOUNDS
ISOMERS
MEASURED VALUES
MERCURY COMPOUNDS
MINERAL ACIDS
ORGANIC COMPOUNDS
OXIDATION
PARAFFIN
PERFORMANCE
PHENOLS
PHENYL RADICALS
PHENYLENE RADICALS
PLATINUM
POLYMERIZATION
POTENTIOMETRY
QUALITATIVE ANALYSIS
QUINONES
REACTION KINETICS
RECORDING SYSTEMS
REDUCTION
RESORCINOL
SILVER COMPOUNDS
SOLUTIONS
THERMODYNAMICS