Showing papers on "Supporting electrolyte published in 1973"
TL;DR: In the presence of small amounts of added acid in acetonitrile, the only observable product by rapid electrochemical techniques is monoprotonated benzoquinone as mentioned in this paper.
61 citations
TL;DR: In this paper, cyclic voltammetry on a natural copper sulphide electrode has been used to study the performance of xanthate ion oxidation in 0.1 M NaF.
52 citations
TL;DR: In this paper, the adsorption of chloride ion on gold electrodes in 0.2 M H2SO4 was studied and it was shown that adsorbed chloride causes an increase in the amount of soluble gold produced during the anodic and cathodic parts of a potential cycle at the electrode.
45 citations
TL;DR: In this paper, polarographic and cyclic voltammetric studies on the reduction of iron(II) complexes with bidentate imine ligands were carried out in acetonitrile solutions with 0,8 M tetraethyl ammonium perchlorate as supporting electrolyte.
45 citations
TL;DR: In this paper, the adsorption of Cl− ions has been studied by a tracer method in the course of electrosorption in the case of Cu2_ ions on platinized platinum.
43 citations
40 citations
TL;DR: In this article, the electrochemical oxidation of phenyldisulfide at a platinum electrode has been studied in acetonitrile with NaClO 4 and fluoroborate salts as supporting electrolytes.
31 citations
TL;DR: A comparison of the efficiency of photon production in the chemiluminescence studies of Weller and Zachariasse and in ECL for the system involving reaction of 9,10-dimethylanthracene (DMA) radical union and tri-p -tolylamine (TPTA) radical cation in tetrahydrofuran (THF) solutions was undertaken as mentioned in this paper.
29 citations
TL;DR: The polarographic reduction of substituted 3-benzylideneindol-2(3H)-ones in ethanol-water (3:2 v/v) has been studied in this paper.
Abstract: The polarographic reduction of a number of substituted 3-benzylideneindol-2(3H)-ones in ethanol–water (3:2 v/v) has been studied. These exhibit one or two reduction waves depending on the supporting electrolyte and the pH of the solution. Changes in E½ are discussed in terms of the Hammett σ values.
22 citations
TL;DR: In this article, the authors investigated the kinetics of the oxygen-ascorbic acid reaction from the viewpoint of deoxygenation of solutions for polarographic analysis and found that the reaction was pseudo first-order with respect to both oxygen and ascorbic acid, and below pH 4 the rate constant was inversely proportional to hydrogen ion concentration.
19 citations
TL;DR: In this paper, voltammetric data for a series of fluoroaromatic hydrocarbons in fluorosulphonic acid containing a base, acetic acid (0·1 M), were reported.
TL;DR: The electrochemical behavior of substituted 2-phenyl-3-aryliminoindolenine 1-oxides (I a-f ) in DMF solution was studied by polarography, cyclic voltammetry, controlled-potential coulometry and u.v spectroscopy as mentioned in this paper.
TL;DR: In this article, the electrode reaction at copper amalgam in complex copper glycollate solutions has been studied by impedance measurements at the equilibrium electrode potential, and it has been shown that the overall electrode reaction proceeds stepwise with the charge transfer between Cu(I) and Cu(II) via the amalgam as rate-limiting at low gating ion concentrations.
TL;DR: Cathodic reactions in methanol and isopropanol have been investigated in the presence of both lithium chloride and tetraethylammonium bromide as supporting electrolytes, finding base is generated stoichiometrically in tetraethicone by reduction of solvent, oxygen and traces of water.
TL;DR: In this paper, the U(VI) reduction at mercury electrode in sulfuric acid solutions was examined by cyclic voltammetry (C. V.). A diffusion coefficient, D, was (5.30 ± 0.08) × 10−6 cm2/sec was obtained for the depolarizer at 25.0± 0.2°C in 1 N K2SO4 (pH = 2).
Abstract: The U(VI) reduction at mercury electrode in sulfuric acid solutions was examined by cyclic voltammetry (C. V.). A diffusion coefficient, D, was (5.30 ± 0.08) × 10−6 cm2/sec was obtained for the depolarizer at 25.0±0.2°C in 1 N K2SO4 (pH = 2). In 1 N K2SO4/1 N H2,SO4 systems the disproportionation of U(V) was found to occur with the constant rate of Kd/[H+] = 6.500 ± 1.000 M−2 sec−1. In 1 M H2SO4 supporting electrolyte pure kinetic control was achieved over the range of scan rates and uranyl concentration (C) investigated, hence linear correlation between cathodic peak current and C (above 5x10−6 M) was obtained. Strong complexing oxyanions, such as phosphate and pyrosulphate, do not interfere with the cathodic peak current. Rapid determination of O/U ratios in uranium oxides and of U in mixed U-Th materials were performed respectively in 1 M H2SO4/1.5 M H3PO4 and 1 M H2SO4/0.2 M K2S204 supporting media, with a reproducibility of ± 1.3% standard deviation.
TL;DR: In this paper, the reduction of barium, strontium and calcium ions in hexamethylphosphoramide (HMPA) has been investigated in the supporting electrolytes of various perchlorates.
Abstract: Polarographic reductions of barium, strontium and calcium ions in hexamethylphosphoramide (HMPA) have been investigated in the supporting electrolytes of various perchlorates. The reduction of these alkaline earth metal ions are strongly influenced by the cation of the supporting electrolyte. When the size of the cation of the supporting electrolyte is small and easily adsorbed on the negatively charged electrode surface as in the cases of Me4N+ and Et4N+ ions, the reduction of the metal ions does not occur until that of the supporting electrolyte. The reduction becomes easier with the increase of cationic size. Thus, in Hex4NClO4 or LiClO4, these metal ions are reduced almost reversibly. These effects of the cation of the supporting electrolyte can be explained as electrode surface phenomena as in the reduction of alkali metal ions.
TL;DR: In this article, the polarographic behavior of 9-nitroanthracene and 9,10-dinitroanthricene was studied in dimethylformamide and the effect of the supporting electrolyte cation on these reduction waves was also investigated.
Abstract: The polarographic behavior of 9-nitroanthracene and 9,10-dinitroanthracene has been studied in dimethylformamide. 9-Nitroanthracene shows consecutive two one-electron diffusion-controlled reduction waves followed by fast chemical reactions. 9,10-Dinitroanthracene, however, shows only one reversible two-electron diffusion-controlled wave. The effect of the supporting electrolyte cation on these reduction waves was also investigated. In alkali metal or alkaline earth metal perchlorate as a supporting electrolyte, the half-wave potentials shift to the anodic side. The relationship between the half-wave potential and the ionic potential of the cation was discussed.
TL;DR: In this paper, a simple electrochemical method for determining the oxygen content of sulpholane has been developed, based on polarography and cyclic voltammetry, and a reaction scheme is proposed.
TL;DR: In this paper, the reduction of Ba2+ at the DME from aqueous solutions of 0.5 M BaCl2, 0.1 M BaI2 and 0.2 M MgCl2 has been studied with the aid of impedance measurements combined with d.c. polarograms.
TL;DR: In this paper, direct and reverse chronopotentiometry was used to study the effect of iodide ion adsorption at the mercury surface in the presence of MeCN solutions.
TL;DR: In this article, the d.c. polarographic reduction of cadmium(II) in a solution of the sodium salt of ethylenediaminetetraacetic acid (EDTA) at pH ⋍ 8 was investigated.
TL;DR: In this paper, the nitrate ion oxidation at platinum electrodes from AgNO3 in acetonitrile solutions has been studied under a wide range of experimental conditions, including Coulommetry, steady state polarization curves in unstirred solutions, rotating disk electrode and chronopotentiometry.
TL;DR: In this article, the effect of cation of the supporting electrolyte on the reduction of tetraalkylammonium perchlorates in DMA has been examined, and it was shown that if the cation is small in size and easily adsorbed onto the negatively charged electrode surface, the reductions of these metal ions are difficult and they either do not occur at all or, if they occur, the limiting currents are small and controlled by prior processes.
Abstract: Polarographic reductions of lithium, barium, strontium, and calcium ions in dimethylacetamide (DMA) have been examined in the supporting electrolytes of various kinds of tetraalkylammonium perchlorates. As having been observed in hexamethylphosphoramide, the reductions of these metal ions in DMA are influenced significantly by the cation of the supporting electrolyte. When the cation of the supporting electrolyte is small in size and easily adsorbed onto the negatively charged electrode surface, as in the case in Et4NClO4, the reductions of these metal ions are difficult and they either do not occur at all until the reduction of the supporting electrolyte itself or, if they occur, the limiting currents are small and controlled by some preceding processes. With the increase of the cationic size of the supporting electrolyte, the reductions become much easier. Thus, in Bu4NClO4 and in Hex4NClO4, these metal ions are reduced almost reversibly. The effect of cation of the supporting electrolyte on the reducti...
TL;DR: In this paper, the anodic oxidation of propylene in acetic acid has been investigated in the presence of an inert supporting electrolyte (LiClO4) as well as of a reactive one (LiNO3).
TL;DR: A polarographic determination of uranium is described, based on the highly selective extraction of uranium(VI) with a chloroform solution of trioctylammonium chloride, followed by re-extraction of uranium into an aqueous 0.5M KCl-0.5m HCl solution, which also serves as the polarographic supporting electrolyte.
TL;DR: In this paper, a detailed procedure for the measurement of the speed of solution streaming in maxima of the second kind is described, and the effect of varying flow rate of mercury, concentration of supporting electrolyte and presence of a surfactant on these velocities is reported.
TL;DR: In this article, the polarographic behavior of diisopropylaminoethanethiol HCl (RSH) has been studied in presence of 0·1 M LiCl at the dme.
TL;DR: In this article, the authors measured the uptake of low concentrations of iron(III) by ion exchange materials in the presence of relatively concentrated supporting electrolyte solutions, and found that the iron-kaolinite bond formed under these conditions was stronger than that normally produced by electrostatic attraction at ion exchange sites.
Abstract: The uptake of low concentrations of iron(III) by ion exchange materials was measured in the presence of relatively concentrated supporting electrolyte solutions. The results were compared with those obtained under the same conditions in the preceding study of kaolinite suspensions. Distinctive differences between kaolinite and strongly acidic polystyrene resin systems at 0.15M ionic strength were found in (a) the nature of the sorption-pH relationships, (b) the reversibility of the reaction with respect to both concentration and temperature, (c) the effects of competing ions, and (d) the extraction of iron after sorption. Such observations confirmed that the iron-kaolinite bond formed under these conditions was stronger than that normally produced by electrostatic attraction at ion exchange sites. When the electrolyte concentration was lowered to 0.01M , some of the above characteristics of ion exchange uptake appeared in kaolinite systems. A comparison of the effects of time, temperature, and ionic strength between iron sorption by kaolinite and by cellulosic ion exchange materials suggested that both ion exchange and specific sorption mechanisms were operating at the lower ionic strength.
TL;DR: In this article, the half wave potential of methylisobutylketone (MIBK) was investigated in the presence of 0.1 M tetrabutyl-ammonium perchlorate.
Abstract: Methylisobutylketone was explored as electrochemical solvent. The purification method of methylisobutylketone, the accessible potential range of this solvent in the presence of 0.1 M tetrabutyl-ammonium perchlorate and the half wave potentials of some typical substances were investigated. Many organic solvents have been explored as electrochemical solvent. Methyl-isobutylketone (MIBK), which has some suitable physical properties as shown in Table l., has not been used for the polarographic determination of an organic phase following solvent extraction mainly because of its low solubility of supporting electrolyte. Lithium perchlorate and n-tetrabutylamrnonium perchlorate, however, was found to be suitable for a supporting electrolyte in this solvent. This paper concerns the purification method of MIBK and the polarographic behavior of some typical substances in MIBK.