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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 theoretical discussion of the course of the reduction of conjugated hydrocarbons has been extended, taking into account the effect of the methylene group on the π-electronic distribution in the intermediately formed radical ions.
Abstract: The current-voltage curves of some 1,n-diphenylpolyenes were measured in a 0.175 molar solution of tetrabutylammoniumiodide in 96% dioxanewater at 25° and 75° C. The experimental half-wave potentials and the roots a of the M.O. secular equation, corresponding to the lowest non-occupied π-electronic level of the conjugated systems, fit the linear equation: ϵ1/2 = a · γ − 1.05 Volts, discussed in part I, giving a mean value of y¯ = − 2.18 ± 0.04 ev (stand, dev.).
The theoretical discussion of the course of the reduction of conjugated hydrocarbons has been extended, taking into account the effect of the methylene group on the π-electronic distribution in the intermediately formed radical ions. From a comparison between the results of these theoretical approximations and the experimental data some reasonable suppositions have been made about the behaviour of these polyenes and their partial reduction products at the dropping mercury electrode during electrolysis.
20 citations
TL;DR: A method for the determination of copper, lead, cadmium and zinc in high purity uranium metal is described in this article. But this method is not applicable to metal containing less than 5 p.p.m. of impurity and results are compared with those obtained by other methods.
20 citations
20 citations
TL;DR: In this paper, the polarographic characteristics of metal-phytochelatin complexes (Me-PC) extracted from the marine alga Phaeodactylum tricornutum were investigated by the use of differential pulse polarography (DPP) at dropping mercury electrode (DME).
Abstract: The polarographic characteristics of metal-phytochelatin complexes (Me-PC) extracted from the marine alga Phaeodactylum tricornutum were investigated by the use of differential pulse polarography (DPP) at dropping mercury electrode (DME). Four metal-phytochelatin complexes differing for the metal bound, namely Cd-, Pb-, Zn- and Cu-PC, were studied, and their polarographic behavior was compared with that of Cd,Zn-thionein and Zn-thionein of mammalian origin. The polarographic characteristics of Me-PC exhibit a dependence on the metal bound to the peptides and on the pH of the solution. Both the organic and inorganic part of Me-PC are electroactive and give polarographic responses depending on their chemical form in solution. Dissociation and formation processes were investigated. The order of stability of the complexes was K′Cu−PC > K′Pb−PC ≥ K′Cd−PC > K′Zn−PC. The same electrochemical mechanisms were found to characterize both the polarographic behavior of metallothioneins and metal-phytochelatin complexes.
20 citations
TL;DR: A rotating disk electrode coated with a thin mercury film is described, suitable for electrochemical determinations of the catalytic constant of superoxide dismutase in a much wider pH range than that accessible to polarographic methods.
20 citations