Showing papers on "Polarography published in 2020"
TL;DR: In this paper, it was shown that pertechnetate ion reduction in acetate solutions on both mercury dropping and solid electrodes occurs stepwise via the following route Tc(VII)→Tc(IV)→ Tc (III)→ tc(0), where Tc is in the metallic state in the electrolytic deposits, but the obtained metal is amorphous.
7 citations
TL;DR: Differential pulse polarographic investigations on the reaction of the amino function of glyphosate and glufosinate herbicides with carbon disulphide and copper(II) perchlorate forming copper(III) dithiocarbamate complexes showed good accuracy and precision of the method.
Abstract: Differential pulse polarographic (DPP) investigations on the reaction of the amino function of glyphosate and glufosinate herbicides with carbon disulphide and copper(II) perchlorate forming copper(III) dithiocarbamate complexes were made in the presence of sodium perchlorate in acetonitrile at dropping mercury electrode (DME). The newly formed herbicide complexes exhibited analytically useful diffusion-controlled peaks at − 115 mV and − 110 mV versus saturated calomel electrode (SCE) with linear relationship between current and concentration. This observation formed the basis for the determination of glyphosate and glufosinate in the concentration ranges 0.34–8.45 μg mL−1 and 0.4–9.91 μg mL−1 respectively with correlation coefficient of 0.999. The method was applied to their determinations in soil, fortified food and spiked water samples to assess their environmental relevance. The recoveries of the herbicides were in the range 89.5%–98.3% with relative standard deviation (RSD) in the ranges 0.8%–1.8% thus showing good accuracy and precision of the method.
5 citations
TL;DR: In this article, a new solid state molybdenum-selective electrode has been developed, which is composed of 20% MoS2, 60% Ag2S, and 20% Cu2S.
Abstract: A new solid state molybdenum-selective electrode has been developed. The electrode is composed of 20% MoS2, 60% Ag2S, and 20% Cu2S. An analytically useful potential change occurred, from 1 × 10-5 to 1 × 10-1 M molybdenum ion. The slope of the linear portion (1 × 10-1 - 1 × 10-5 M) was about 45 ± 2 mV/10-fold concentration changes in molybdenum. It was found that pH change between 1 and 12 had no effect on the potential of the electrode. There was no interference of most common cations such as K+, Na+, Ca2+, Mg2+, Cu2+ and Fe3+ anions such as Cl-, , and . The lifetime of the electrode was more than 2 years, when used at least 4 - 5 times a day, and the response time was about 30 s. This electrode has been used for the determination of molybdenum ion in wine using standard addition method. The validation of the electrode has been made with a commercial molybdenum DP polarography and high consistency was obtained.
2 citations
10 Dec 2020
TL;DR: In this paper, the optimum conditions for the determination of manganese at low concentrations have been developed employing differential pulse polarography, and the limit of quantification of 1.04 µg/ml was achieved.
Abstract: The optimum conditions for the determination of manganese at low concentrations have been developed employing differential pulse polarography. The limit of quantification of 1.04 µg/ml was achieved. The possible interference of coexisting metal ions was examined and ruled out. The method has been successfully applied for the analysis of manganese in industrial waste samples.
1 citations
TL;DR: In this paper, the electrochemical behavior of m-nitrosulphonic acid of benzene was studied by polarography, voltammetry at glassy carbon electrode, electrolysis at the controlled potential, and electrolysis in galvanostatic mode.
Abstract: The electrochemical behavior of m-nitrosulphonic acid of benzene was studied by polarography, voltammetry at glassy carbon electrode, electrolysis at the controlled potential, and electrolysis in galvanostatic mode. A distinguishing feature of the m-nitrosulphonic acid of benzene electroreduction, as compared with that of aromatic nitro-compounds, both on mercury dropping electrode and glassy carbon electrode, is shown to be a strong dependence of parameters and shape of the polarization curve on the supporting electrolyte solution composition and рН in neutral and alkaline solutions. The two waves observed are bound to the reduction of undissociated m-nitrosulphonic acid of benzene molecule and its anion; the reduction intermediately product is hydroxylaminesulphonic acid of benzene. The wave of its further reduction to m-aminosulfonic acid of benzene is camouflaged by the supporting-electrolyte discharge. Ammoniac-buffered solutions can be recommended for preparative electrosynthesis of m-aminosulfonic acid of benzene because its yield in the electrolysis at nickel cathode in galvanostatic mode in these solutions is as high as 92.8%, with current efficiency of 82.0%.