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 article, an electrochemical method for the determination of carbaryl, after prior oxidation to 1,4-naphthoquinone in natural water and soils, was reported.
Abstract: An electrochemical method for the determination of carbaryl, after prior oxidation to 1,4-naphthoquinone in natural water and soils is reported. The coulometric oxidation of carbaryl at a platinum electrode was studied using 0.024 mol/L Britton-Robinson buffer (pH 7.0). The reduction of the oxidation product 1,4-naphthoquinone at a dropping mercury electrode was used for the indirect determination of carbaryl after separation on C18 Sep-pak cartridges by differential pulse polarography (detection limits: 0.41 mg L−1 of water and 0.47 mg kg−1 of soil) and directly without separation by adsorptive stripping voltammetry (detection limits: 5 μg L−1 of water and 7 μg kg−1 of soil, for 75 s preconcentration time). Relative errors were lower than 3.7% and relative standard deviations smaller than 4.5%.
20 citations
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20 citations
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20 citations
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TL;DR: In this article, the polarographic method of discontinuously changing potential (4-128 Hz) known as the Kalousek commutator technique was used for the study of adsorption-desorption phenomena of tri-n-butyl phosphate, thymol and sodium lauryl sulphate on the mercury from aqueous solutions.
20 citations
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TL;DR: The electrochemical behavior of Clostridium pasteurianum ferredoxin (Cl.Fd) was studied by a.c. polarography with the dropping mercury electrode.
Abstract: The electrochemical behavior of Clostridium pasteurianum ferredoxin (Cl.Fd) was studied by a.c. polarography with the dropping mercury electrode. The a.c. polarograms observed in acidic media (pH 8) were assigned to a two-step one-electron transfer (EE mechanism) to the iron-sulfur clusters of Cl.Fd adsorbed on the mercury electrode surface ((Cl.Fd)ad). The a.c. polarographic behavior of (Cl.Fd)ad observed in basic media was interpreted by theory of a.c. polarography of a two-step surface redox reaction. The formal standard oxidation-reduction potential of (Cl.Fd)ad was determined to be −0.33 V vs. NHE at pH 7.0, and its pH dependence was −30 mV/pH between pH 8 and 10.
20 citations