Polarographic investigation of reduction process of some azodyes and their complexes with rare earths

Dubenska, Liliya; Levytska, Halyna; Poperechna, Nataliya

doi:10.1016/s0039-9140(00)00529-4

Cited by 22 publications

(17 citation statements)

References 6 publications

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“…The cyclic voltammogrames of the investigated azo dyes showed 1-3 irreversible cathodic peaks [15,16]. The number of peaks depends on the pH and the nature of the compounds.…”

Section: Electrochemical Behavior Of Azo Dye and Redox Mechanism In Amentioning

confidence: 99%

New Cyclic Voltammetry of 3-(4-N-Pyridine-2-yl Benzene Sulfonamide Azo)-1-Nitroso Naphthol and the Use of it for Enhancement of Cobalt Oxide Nano Particles

Mohammed¹

2017

Nano BioMed ENG

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The electrochemical behavior of the 3-(4-N-pyridine-2-yl benzene sulfonamide azo)-1-nitroso naphthol reagent and its complex with Co (II) has been studied at glassy carbon disk electrode in different supporting electrolyte at concentration 1 mol and scan rate (100 mV/s). 3-(4-N-pyridine-2-yl benzene sulfonamide azo)-1-nitroso naphthol was used for enhance the properties of nano cobalt oxide by ligand exchange reaction on nanoparticles.

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“…The cyclic voltammogrames of the investigated azo dyes showed 1-3 irreversible cathodic peaks [15,16]. The number of peaks depends on the pH and the nature of the compounds.…”

Section: Electrochemical Behavior Of Azo Dye and Redox Mechanism In Amentioning

confidence: 99%

New Cyclic Voltammetry of 3-(4-N-Pyridine-2-yl Benzene Sulfonamide Azo)-1-Nitroso Naphthol and the Use of it for Enhancement of Cobalt Oxide Nano Particles

Mohammed¹

2017

Nano BioMed ENG

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“…Of special interest are procedures for the direct voltammetric determination of REE(III) based on the additional adsorption waves (peaks) corresponding to the reduction of electrochemically active ligands from their complexes formed by REEs and the following organic reagents: o -cresolphthalexon [64,65], Alizarin complexone, Alizarin Red, Pyrocatechol Violet [13,19], Calcein, Dibromopyrogallol Red [66], cupferron [67,68], and mixtures of cupferron and diphenylguanidine, e e Rhodamine B and diphenylguanidine [13], and 8-hydroxyquinoline and maleic acid [69]. The following azo compounds are used most frequently: Eriochrome Violet B, Eriochrome Black PV, Mordant Blue 31 [70], Acid Blue K [71], Mordant Red 19 [72], Eriochrome Blue SE [73], Solochrome Violet RS [73][74][75], Eriochrome Black T [76][77][78], Magneson [78,79], arsenazo I [78,80], and Eriochrome Red B [81,82]. These procedures are highly sensitive and allow trace amounts of both individual and total REE(III) ions to be determined in phosphates, alloys, ores, minerals, etc.…”

Section: Use Of Organic Reagents For the Voltammetric Determination Omentioning

confidence: 99%

“…Complexes with azo dyes in the majority of cases are reduced by the first mechanism [72,78]. Generally, this mechanism can be written as follows:…”

Section: Use Of Organic Reagents For the Voltammetric Determination Omentioning

confidence: 99%

“…NH 4 + metric determination. Both total REE(III) and individual REE(III) ions in their mixture [65,67,72] and in the presence of 100-fold amounts of Ca(II), Mg(II), Al(III), Cu(II), Cd(II), Hg(II), Zn(II), and In(III) [65,71,78] can be determined. In adsorption stripping voltammetry, the sensitivity of determination reached 10 -9 -10 -10 M without the preconcentration and separation of concomitant elements.…”

Section: Use Of Organic Reagents For the Voltammetric Determination Omentioning

confidence: 99%

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Use of organic reagents for the voltammetric determination of rare-earth elements

2005

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Study of the properties of rare-earth elements (REEs) and their alloys and compounds is important from the viewpoints of both practice and theory, because these elements, by virtue of their valuable properties, are widely used in state-of-the-art technologies. Rare-earth elements show considerable promise for metallurgy, machine building, instrument making, the glass industry, and medicine [1]. Rare-earth silicides and germanides are used in the reactor-building industry. The relative thermal stability of REE along with their large activation cross-sections for neutron capture allows them to be used as neutron-absorbing materials for different units. Rare-earth elements enter into the composition of scintillation materials as activators. The characteristics of these materials significantly depend on the concentrations of REEs; therefore, reliable, sensitive, selective, and rapid procedures are required for their quality control. Rare-earth elements are most often determined by atomic emission spectrometry, which allows impurities of individual lanthanides to be determined in the presence of others. Luminescence and spectrophotometry are also often used. These methods are sensitive and selective, but they often require unavailable and specific reagents. Voltammetric methods are competitive with the above methods and, at the same time, possess important advantages, such as the high sensitivity and reproducibility of the results, rapidity, the possibility of the simultaneous determination of several components, and the availability of equipment [2].The reduction of REE(III) ions, especially Eu(III) and Yb(III), has been studied quite well [3]. There is information on the effect of pH and the supporting electrolyte; the kinetics of the Eu(III) Eu(II) and Yb(III) Yb(II) conversions was studied in [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Eu(III) and Yb(III) can be determined at a dropping mercury electrode (d.m.e) in the presence of other REEs [11][12][13][19][20][21][22][23][24][25][26]. The studies of Eu(III) reduction in aqueous-organic and organic media showed that these media were unsuitable for determining europium(III) because of their low conductivities [27][28][29][30].The REE(III) ions are reduced in the potential range from -1.7 to -2.0 V. There is no unified opinion about the nature of their polarographic waves; different assumptions were made in [31-41]. These waves (or peaks) are obtained at the potentials close to the potentials of the supporting electrolyte reduction and, therefore, are poorly selective. REE(III) can be determined by the proposed procedures only after the electrochemical or chemical separation of foreign REE(III) and Al(III), Cd(II), Co(II), Cu(II), Ni(II), Pb(II), Zn(II), and other ions [33,[42][43][44][45][46]. Therefore, voltammetry in conventional supporting electrolytes offers no advantages over other methods and is rarely used.At present, more than 30 organic ligands have been proposed for the voltammetric determination of individual or combined REEs. The selectivit...

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“…The EBT in an alkaline solution was found to be appropriate as post-column reagent for the determination of rare earths by ion chromatography [9] . A procedure for the determination of manganese, which was complexed with EBT, in seawater by flow-injection preconcentration coupled to electrochemical atomic absorption spectroscopy was developed [10] . The voltammetry behavior of six azodyes (EBT and others) with various structures of the interface circuit and substituents in O, O ' -positions and their rare earth complexes was studied in detail [11] .…”

Section: Introductionmentioning

confidence: 99%

Cyclic Volta Metric Study of Alizarin Yellow R and Some Analogous Arylazo Compounds in DMF and in Aqueous Media

Mohran¹

2005

American J. of Applied Sciences

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Abstract:The Cyclic Voltammetry (CV) was used to investigate the electrochemical behavior of alizarin yellow R and some analogous arylazo compounds having almost the same central azo group. For this purpose, the substances chosen for the measurements are Alizarin Yellow R (AYR), Eriochrome Black T (EBT) and Sudan II (SUD II). The investigations were carried out at room temperature (298 K) in both aqueous solutions (HClO 4 , NaClO 4 , KNO 3 ) and non-aqueous medium (DMF), on the Hanging Mercury Drop Electrode (HMDE) and on the conventional Pt-disc electrode respectively. The CV results of AYR in aqueous solutions are characterized by a trace crossing that appears upon scan reversal, which is relatively rare. The CV experimental data together with their theoretical calculations for all compounds in DMF reveal unexpectedly irreversible radical anion step as a result of cis trans-isomerisation followed by reversible dianion process.

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Polarographic investigation of reduction process of some azodyes and their complexes with rare earths

Cited by 22 publications

References 6 publications

New Cyclic Voltammetry of 3-(4-N-Pyridine-2-yl Benzene Sulfonamide Azo)-1-Nitroso Naphthol and the Use of it for Enhancement of Cobalt Oxide Nano Particles

New Cyclic Voltammetry of 3-(4-N-Pyridine-2-yl Benzene Sulfonamide Azo)-1-Nitroso Naphthol and the Use of it for Enhancement of Cobalt Oxide Nano Particles

Use of organic reagents for the voltammetric determination of rare-earth elements

Cyclic Volta Metric Study of Alizarin Yellow R and Some Analogous Arylazo Compounds in DMF and in Aqueous Media

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