scholarly journals Model of Reactant Adsorption in dc Polarography

2020 ◽  
Vol 93 (3) ◽  
Author(s):  
Milivoj Lovrić
Keyword(s):  
Dc Polarography

Determination of Tinidazole in Tablets by dc Polarography

1976 ◽  
Vol 65 (5) ◽  
pp. 736-737 ◽  
Author(s):  
Marjan Slamnik
Keyword(s):  
Dc Polarography

scholarly journals Electrochemical Behaviour of N′-(p-toluenesulphonyl)-3-methyl-4-(4′-substituted arylhydrazono) pyrazolin-5-ones

2012 ◽  
Vol 9 (4) ◽  
pp. 1864-1874
Author(s):  
V. Nagaraju ◽  
R. Sreenivasulu ◽  
P. Venkata Ramana
Keyword(s):  
Electrochemical Behaviour ◽  
Reduction Process ◽  
Effect Of Solvent ◽  
Buffer Solutions ◽  
Diffusion Controlled ◽  
Controlled Potential Electrolysis ◽  
Dc Polarography ◽  
Controlled Potential ◽  
Ph Range ◽  
And Diffusion

The electrochemical behaviour of N′-(p-toluenesulphonyl)-3-methyl-4-(4′-substituted arylhydrazono) pyrazolin-5-ones has been investigated at dme and gc electrodes in buffer solutions of pH 2.0, 4.0, 6.0, 8.0 and 10.0 using dc polarography and cyclic voltammetry and coulometry. The compounds exhibit one well defined wave in the entire pH range of study. The process is irreversible and diffusion controlled. Controlled potential electrolysis indicates the involvement of four electrons in the reduction process. The effect of solvent, cations and anions, temperature and substitutents on the mechanism of reduction has been studied. Based on the results obtained the mechanism of reduction has been suggested.

Nonaqueous Polarographic Analysis of Nitroglycerin

1969 ◽  
Vol 52 (4) ◽  
pp. 847-853
Author(s):  
Albert L Woodson ◽  
Larry L Alber
Keyword(s):  
Wave Height ◽  
Concentration Profile ◽  
Organic Nitrates ◽  
Nonaqueous Medium ◽  
Tetrabutylammonium Perchlorate ◽  
Polarographic Analysis ◽  
Dc Polarography ◽  
Chromatographic Procedure ◽  
Column Chromatographic

Abstract The DC and AC polarographic response of nitroglycerin in the nonaqueous medium of acetonitrile-0.1M tetrabutylammonium perchlorate is presented. DC polarographic results are shown to be superior with respect to sensitivity limits and linearity of the response (wave height) vs. concentration profile. DC polarography is applied successfully to the analysis of two types of commercial formulations containing nitroglycerin. The results are compared with other methods for the determination of nitroglycerin, e.g., infrared, the phenoldisulisulfonic acid procedure for organic nitrates, and a column chromatographic procedure.

Kinetics of electroreduction of Zn2+ at mercury in nonaqueous solutions

1994 ◽  
Vol 72 (7) ◽  
pp. 1691-1698 ◽  
Author(s):  
Mariléa Manzini ◽  
Andrzej Lasia
Keyword(s):  
Cyclic Voltammetry ◽  
Charge Transfer ◽  
Supporting Electrolyte ◽  
Donor Number ◽  
Nonaqueous Solutions ◽  
Dc Polarography ◽  
One Step ◽  
A Charge ◽  
Tetraethylammonium Perchlorate ◽  
Kinetics Of

The electroreduction of Zn2+ was studied in propylene carbonate (PC), acetonitrile (ACN), and hexamethylphosphoramide (HMPA) on mercury at various concentrations of tetraethylammonium perchlorate as a supporting electrolyte using dc polarography, cyclic voltammetry, chronoamperometry, and ac polarography. It was found that in PC and ACN the electroreduction process proceeds in one step. In HMPA, however, the electroreduction proceeds through a CEE mechanism in which a chemical reaction is followed by a charge transfer in two steps. The heterogeneous rate constants, corrected for the double layer effects, decrease with increase in the solvent donor number. The electroreduction process proceeds through the cation transfer mechanism.

DC Polarography of Cephradine and Its Application to Capsules

1979 ◽  
Vol 62 (3) ◽  
pp. 556-559
Author(s):  
Luis J Nuñez-Vergara ◽  
Juan A Squella ◽  
Ernesto M Gonzalez
Keyword(s):  
Quantitative Analysis ◽  
Spectral Data ◽  
Linear Relation ◽  
Dosage Forms ◽  
Polarographic Method ◽  
Acidic Hydrolysis ◽  
Diffusion Controlled ◽  
Dc Polarography ◽  
Coloring Matter

Abstract A polarographic method has been developed for the quantitative analysis of cephradine and its dosage forms. Direct determinations on capsules are carried out; excipients and coloring matter do not interfere in the determination. The electroactive product is formed by acidic hydrolysis with 5.0N HCl and heating at 80°C for 60 min. Two polarographic waves are obtained: I = - 0.46 v and II = - 0.78 v vs. SCE. Both reduction waves are diffusion controlled. Wave I is preferred for analytical purposes. The precise chemical identity of the electroactive product has not been determined, but UV spectral data and the TLC Rf value are reported. A linear relation is established for levels of cephradine between 10-2 and 10-5M in 5.0N HCl.

Controlled-potential differential DC polarography

1966 ◽  
Vol 224 (1) ◽  
pp. 1-22 ◽  
Author(s):  
W. D. Shults ◽  
D. J. Fisher ◽  
H. C. Jones ◽  
M. T. Kelley ◽  
W. B. Schaap
Keyword(s):  
Dc Polarography ◽  
Controlled Potential

Influence of a preceding chemical reaction on limiting currents in normal pulse polarography and in dc polarography

1984 ◽  
Vol 167 (1-2) ◽  
pp. 15-42 ◽  
Author(s):  
J. Galvez ◽  
C. Serna ◽  
A. Molina ◽  
H.P. Van Leeuwen
Keyword(s):  
Chemical Reaction ◽  
Pulse Polarography ◽  
Dc Polarography

Competitive chemical reactions in DC polarography: Influence of fast protonation equilibria on CE and ECE mechanisms

1991 ◽  
Vol 56 (1) ◽  
pp. 68-77 ◽  
Author(s):  
Eulogia Muñoz ◽  
José L. Avila ◽  
Juan J. Ruiz ◽  
Luis Camacho
Keyword(s):  
Kinetic Parameters ◽  
Chemical Reactions ◽  
Limiting Current ◽  
Quasi Equilibrium ◽  
Polarographic Study ◽  
Protonation Equilibria ◽  
Direct Competition ◽  
Dc Polarography ◽  
Catalytic Effects

We carried out a DC polarographic study of the limiting current for CE and ECE processes with chemical stages subject to potential catalytic effects and in direct competition with protonation reactions in quasi-equilibrium. The aforesaid competition may result in the appearance of maxima in the limiting current vs pH plots for CE mechanisms. We established the conditions required for the rise of such maxima, and developed methods for the calculation of kinetic parameters. The competition did not result in any maxima in the above-mentioned plots for ECE mechanisms; however, we established criteria for their potential identification.

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