scispace - formally typeset
Search or ask a question
Topic

Polarography

About: Polarography is a research topic. Over the lifetime, 4772 publications have been published within this topic receiving 75478 citations.


Papers
More filters
Journal ArticleDOI
01 Jan 1984-Analyst
TL;DR: In this paper, it was shown that 0.2 M sodium fluoride solution is a superior medium for trace level determinations, and that the sensitivity in this medium is 0.64 nA (nmol l −1) −1 Cr(VI) at the 10-8M level.
Abstract: The polarographic determination of Cr(VI) is usually performed in a sodium hydroxide, ammonium tartrate or ammonium acetate supporting electrolyte. This study suggests that 0.2 M sodium fluoride solution is a superior medium for trace level determinations. With differential-pulse polarography, the sensitivity in this medium is 0.64 nA (nmol l–1)–1 Cr(VI) at the 10–8M level, and the detection limit is 1.6 × 10–8M Cr(VI). With 1 × 10–7M Cr(VI), 10-fold excesses of Fe(III), Cl– and NO3– do not change the current by more than 4%; Cu(II) causes an 8% decrease. The presence of Fe(III), Cu(II) and Cl– causes significant error with ammonium acetate and ammonium tartrate electrolytes.

21 citations

Journal ArticleDOI
TL;DR: In this article, the polarographic behavior of the five phenyl-substituted ethenes (styrene, stilbene, 1,1-diphenylethylene, triphenylthylene and tetraphenylethsylene) at the dropping mercury electrode has been examined in dimethylformamide (DMF) and DMF-water solution containing 0.2 M tetra-n-butylammonium iodide as background electrolyte on the basis of tbo various criteria for reversibility based on direct current polarography.
Abstract: The polarographic behavior of the five phenyl-substituted ethenes (styrene, stilbene, 1,1-diphenylethylene, triphenylethylene and tetraphenylethylene) at the dropping mercury electrode has been examined in dimethylformamide (DMF) and DMF-water solution containing 0.2 M tetra-n- butylammonium iodide as background electrolyte on the basis of tbo various criteria for reversibility based on direct current polarography. Heterogeneous rate constants on alpha n/sub a/ values were calculated on the basis of the spherical expanding electrode theory. None of the reversibility criteria predictions for the various possible mechanisms are entirely in accord with the experimental results. Although polarographic reduction of the phenyl-substituted ethenes is indicated to occur by processes which involved a change of electrode transfer mechanisms, because of the lack of adequate theoretical bases for such a mechanism change and for the effects of variation in double layer structure on any given mechanism. (auth)

21 citations

Journal ArticleDOI
TL;DR: In this article, the authors used dc polarography, differential pulse polarography (DPP), cyclic voltammetry, controlled potential electrolysis, and chronoamperometry to study the electrochemical reduction of methylcobalamin and coenzyme B12.

21 citations

Journal ArticleDOI
TL;DR: The electroreduction of cobalt (II) from solutions containing pyridine was investigated with stationary electrode polarography at a hanging mercury drop electrode using both single-scan and cyclic experiments.

21 citations


Network Information
Related Topics (5)
Cyclic voltammetry
55.9K papers, 1.4M citations
84% related
Detection limit
34.3K papers, 644.8K citations
82% related
Electrochemistry
37.8K papers, 995K citations
82% related
Reagent
60K papers, 1.2M citations
81% related
Platinum
49.6K papers, 1.1M citations
81% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202313
202234
20213
20205
201912
201810