Determination of optimal electrochemical parameters to reproduce copper artistic patina on quaternary alloys

2021 ◽  
pp. 131414
Author(s):  
R. González-Parra ◽  
A. Covelo ◽  
M. Hernández
Keyword(s):  
Quaternary Alloys ◽  
Electrochemical Parameters

Polarographic and spectrophotometric behaviour of some N-p-phenyl substituted benzamidines

1991 ◽  
Vol 56 (12) ◽  
pp. 2791-2799 ◽  
Author(s):  
Juan A. Squella ◽  
Luis J. Nuñez-Vergara ◽  
Hernan Rodríguez ◽  
Amelia Márquez ◽  
Jose M. Rodríguez-Mellado ◽  
...  
Keyword(s):  
Spectrophotometric Study ◽  
Absorption Bands ◽  
Electrochemical Parameters ◽  
Wide Ph Range ◽  
Group A ◽  
Substituent Constants ◽  
Ph Range ◽  
The Waves

Five N-p-phenyl substituted benzamidines were studied by DC and DP polarography in a wide pH range. Coulometric results show that the overall processes are four-electron reductions. Logarithmic analysis of the waves indicate that the process are irreversible. The influence of the pH on the polarographic parameters was also studied. A UV spectrophotometric study was performed in the pH range 2-13. In basic media some variations in the absorption bands were observed due to the dissociation of the amidine group. A determination of the pK values was made by deconvolution of the spectra. Correlations of both the electrochemical parameters and spectrophotometric pK values with the Hammett substituent constants were obtained.

Determination of the Charge Transfer Parameters of 4,4'-(Ferrocene-1,1'-diyldivinylene)bis(benzo-15-crown-5) at Glassy Carbon Electrode

1997 ◽  
Vol 62 (11) ◽  
pp. 1690-1697
Author(s):  
Mohamed El-Metwally Ghoneim ◽  
Youssef Ibrahim Moharram ◽  
Norman Taylor
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Carbon Electrode ◽  
Peak Separation ◽  
Electrochemical Parameters ◽  
Oxidation Wave ◽  
Transfer Parameters ◽  
Digital Simulations ◽  
And Diffusion

Electrochemical parameters of 4,4'-(ferrocene-1,1'-diyldivinylene)bis(benzo-15-crown-5) were collected using cyclic voltammetry, chronoamperometry and chronopotentiometry at a glassy carbon electrode. One-electron quasi-reversible oxidation wave was obtained at Epa of 0.532 V and Epc of 0.387 V. The peak separation, ∆Ep, standard heterogeneous rate constant, k0, and diffusion coefficient, D, of the electrochemical species have been processed by convolution and deconvolution transformations. Digital simulations using the kinetic parameters were also performed.

scholarly journals Determination of low chlorine content in organic compounds and polymers using an «Expert-006» coulometer

2018 ◽  
Vol 84 (7) ◽  
pp. 16-20
Author(s):  
D. Kh. Kitaeva ◽  
A. G. Buyanovskaya ◽  
O. A. Levinskaya ◽  
S. L. Dzvonkovski
Keyword(s):  
Coulometric Titration ◽  
Silver Ions ◽  
Electrolytic Cell ◽  
Chloride Ions ◽  
Chlorine Content ◽  
Residual Chlorine ◽  
Coulometric Determination ◽  
Electrochemical Parameters ◽  
Organic Matrices

A method of visual mercurimetric titration of chloride ions is widely used in elemental microanalysis for determination of chlorine content in organic substances after their combustion in an oxygen-filled flask. However, when chlorine content is less than 0.5%, the mercurimetric method fails to provide essential accuracy, and a more sensitive method of chlorine coulometric titration by electrogenerated silver ions appeared favorable. We consider a possibility of determining the microgram content of chloride-ions in solutions using a digital coulometric analyzer («Expert-006» produced by «Econics-Expert» (Moscow)) supplemented with an electrolytic cell with silver electrodes. The coulometer was tested in different operation modes to select the optimal electrochemical parameters of ion chloride titration and develop a technique for coulometric determination of chloride ions which in combination with the preliminary burning of the analyzed substances in an oxygen-filled flask provides determination of the residual chlorine in organic matrices at a level of 0.1 – 0.5%. The proposed technique was used to determine the residual chlorine in a number of polymers. The relative error did not exceed 5% at chlorine concentrations of 0.16 – 0.28%.

scholarly journals Voltammetric Studies of Anthracen-9-ylmethylene-(3,4-dimethyl-isoxazol-5-yl)-amine Compound at Platinium Electrode

2015 ◽  
Vol 18 (3) ◽  
pp. 177-181 ◽  
Author(s):  
A. A. Al-Owais ◽  
I. S. El-Hallag
Keyword(s):  
Cyclic Voltammetry ◽  
Radical Cation ◽  
Reaction Pathway ◽  
Digital Simulation ◽  
Electrode Reaction ◽  
Simulation Techniques ◽  
Electrochemical Parameters ◽  
Voltammetric Behavior ◽  
Voltammetric Studies

The voltammetric behavior of anthracen-9-ylmethylene-(3,4-dimethyl-isoxazol-5-yl)-amine compound at Platinium electrode has been performed via convolutive cyclic voltammetry and digital simulation techniques using a conventional platinium electrode in 0.1 mol L-1 tetrabutylammonium perchlorate (TBAP) in acetonitrile solvent (CH3CN). The compound loss one electron forming radical cation followed by fast chemical step and the radical cation loss another two electrons producing trication which followed by chemical reaction (ECEC). Cyclic voltammetry and convolutive voltammetry were used for determination of the chemical and the electrochemical parameters of the electrode reaction pathway of the investigated compound. The Electrochemical parameters such as α, ks, Eo , D, and kc of the investigated isoxazol derivative were verified via digital simulation technique. Voltammetric studies of the investigated isoxazol derivative compound under consideration was presented and discussed.

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