Topic
Polarography
About: Polarography is a research topic. Over the lifetime, 4772 publications have been published within this topic receiving 75478 citations.
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TL;DR: In this paper, a calibration procedure for a Clark-type oxygen electrode over a wide range of temperatures is described, and the autoxidation of duroquinol (2,3,5,6-tetramethyl-1,4-benzenediol) was used to verify the electrode's ability to accurately sense the total amount of dissolved O2 in an aqueous buffer.
34 citations
TL;DR: In this paper, the reversible reduction of nicotinamide methiodide and methochloride has been studied using cathodic reduction at a mercury surface, sodium dithionite, hydrogen and colloidal platinum, and various leuco-dyes.
Abstract: The reversible reduction of nicotinamide methiodide and methochloride has been studied using cathodic reduction at a mercury surface, sodium dithionite, hydrogen and colloidal platinum, and various leuco-dyes. The method of cathodic reduction was the most satisfactory. Polarography showed a 2-step reduction. Macro-reductions at a mercury surface suggested dimerization of the intermediate free radical. The behaviour of dihydromethylnicotinamide towards hydrogen ions, oxygen, iodine, potassium ferricyanide, ferric iron, and various dyes has been examined. Although it is not readily oxidized by oxygen it is capable of reducing most other systems with a higher Eo?:. Two methods of estimating the reduced compound are suggested and involve (a) the potentiometric titration of potassium ferricyanide at pH 9.1 and (b) the reduction and decolourization of 2.6-dichlorophenolindophenol at pH 4.7. The oxidation-reduction potential of nicotinamide methiodide has been measured by oxidative titration of the dihydro-compound at pH 9.1 and 30±0.01 °C and found to be -0.36 ± 0.02 V against the normal hydrogen electrode. The titration curve does riot show a separation of the two reduction steps. Evidence is discussed for the production of both o- and p-dihydromethylnicotinamide during reduction.
34 citations
34 citations
TL;DR: In this article, the potentials of the hydrogen electrode were derived from polarographic (cyclovoltametric) and potentiometric measurements providing new data for up to forty non-aqueous solvents.
34 citations
34 citations