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, the i-t-E relations have been analyzed in differential pulse polarography (DPP) for processes in which a very fast dimerization preceded by a reversible electron transfer takes place.
18 citations
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TL;DR: This paper introduces a simple, fast and reliable electroanalytical method for differential-pulse polarography based on electrochemical reduction at a dropping mercury electrode for the determination of 2-ethylhexyl-4-methoxycinnamate (EHMC) alone and in association with 4-methylbenzylidene camphor (MBC) or 2-hydroxy- 4- methoxybenzophenone (BENZ-3) in samples of commercial cosmetic preparations
18 citations
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TL;DR: In this article, a simple, sensitive, and accurate differential pulse polarography method for simultaneous determination of trans-cinnamaldehyde and benzaldehyde in food and drug samples was developed.
Abstract: A simple, sensitive, and accurate differential pulse polarography method for simultaneous determination of trans-cinnamaldehyde and benzaldehyde in food and drug samples were developed. DC polarography, CV, and coulometric techniques were used for investigation the electrochemical behavior of both compounds. In phosphate buffer (pH = 8.2) and 10% v/v of methanol the differential pulse voltammograms of trans-cinnamaldehyde (−1.05 V) and benzaldehyde (−1.31 V) display reproducible peaks. Under these conditions a strict linearity between both analyte concentrations and their peaks height were observed. The detection limits were calculated to be 2.5 × 10−8 and 1.2 × 10−8 M for trans-cinnamaldehyde and benzaldehyde in pH = 8.2, respectively. The relative standard deviations for 1.0 × 10−6 M of both analytes were 2.04 and 1.18. The heat stability of trans-cinnamaldehyde was studied, and it was found that trans-cinnamaldehyde undergoes a heat-induced decomposition at low temperature (>70°C) to produce b...
18 citations
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01 Oct 1974TL;DR: In this article, a portable polarographic instrument and method for the rapid repetitive quantitative determination of polarographically reactive species in aqueous solution utilizing a sample cell in which are placed a conducting sample solution, a suitable reference electrode and a fixed area working electrode and, connected to the electrodes, a special circuit for impressing across the cell a reducing or oxidizing voltage throughout a time linear pre-selected range of scanning potential, proportionately converting the consequent current flow to a potential, and measuring the potential.
Abstract: A special purpose portable polarographic instrument and method for the rapid repetitive quantitative determination of polarographically reactive species in aqueous solution utilizing a sample cell in which are placed a conducting sample solution, a suitable reference electrode and a fixed area working electrode and, connected to the electrodes, a special circuit for (1) impressing across the cell a reducing or oxidizing voltage throughout a time linear pre-selected range of scanning potential, (2) proportionately converting the consequent current flow to a potential, and (3) measuring the potential. The maximum potential is retained in a peak seeking voltage circuit and is read on a voltmeter in a voltage follower circuit. The polarographic test utilizing the instrument is made more specific for O PARALLEL -C- compounds, such as aldehydes, by reacting the test sample in aqueous medium with a hydrazine acid addition salt at a pH of about 3 to 6.5 to form the hydrazone in aqueous medium which is detectable with great sensitivity and specificity. The working electrode may be underlying or may be suspended, but in any event, is best replaced or renewed or cleaned between determinations.
18 citations
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TL;DR: In the presence of selenium(IV) and molybdenum(VI) a new polarographic peak appears which corresponds to a hydrogen catalytic wave which is obtained by differential pulse polarography and at higher amounts of interfering ions the interference is eliminated by the addition of EDTA.
18 citations