Electrochemical Behavior of Carbon Paste Electrode with Gold-Bearing Pyrite in Bioleaching

2013 ◽  
Vol 825 ◽  
pp. 360-363 ◽  
Author(s):  
Zhi Wu ◽  
Shui Ping Zhong ◽  
Zeng Ling Wu ◽  
Zhong Sheng Huang ◽  
Brenda K.C. Chan
Keyword(s):  
Cyclic Voltammetry ◽  
Carbon Paste Electrode ◽  
Electrochemical Behavior ◽  
Oxidation Rate ◽  
Elemental Sulphur ◽  
Polarization Current ◽  
Carbon Paste ◽  
Fundamental Study ◽  
Paste Electrode ◽  
Gold Bearing

The dissolution of gold-bearing pyrite plays an important role in bioleaching of gold. This paper describes a fundamental study on the electrochemical behavior and reaction mechanisms of gold-bearing pyrite leaching in the form of Carbon Paste Electrode (CPE) with and without microorganisms using Cyclic Voltammetry (CV) and polarization curve. A two step process was suggested from Cyclic voltammetry. Electrode passivation by elemental sulphur was observed below 700mV (vs. SCE), elemental sulphur was then oxidized to sulphate when the electrode potential further increased from 700mV. The polarization current density of CPE and the oxidation rate of pyrite are further enhanced by the presence of microorganisms. Analyses of EDS and XPS confirmed the formation of elemental sulphur and sulphate. This electrochemical method successfully showed its simplicity and reliability to measure oxidation rate of gold bearing pyrite.

Electrochemical Behavior of Cu(II) on Carbon Paste Electrode Modified by Humic Acid, Cyclic Voltammetry Study

2002 ◽  
Vol 14 (1) ◽  
pp. 71-77 ◽  
Author(s):  
Wilson T. Lopes da Silva ◽  
Christine Thobie-Gautier ◽  
Maria O. O. Rezende ◽  
Nabil El Murr
Keyword(s):  
Cyclic Voltammetry ◽  
Humic Acid ◽  
Carbon Paste Electrode ◽  
Electrochemical Behavior ◽  
Carbon Paste ◽  
Paste Electrode

Evaluation of the Electrochemical Behavior of Pentachlorophenol by Cyclic Voltammetry on Carbon Paste Electrode Modified by Humic Acids

2007 ◽  
Vol 79 (1) ◽  
pp. 63-67 ◽  
Author(s):  
Flávia P. S. Airoldi ◽  
Wilson T. L. Da Silva ◽  
Frank N. Crespilho ◽  
Maria O. O. Rezende
Keyword(s):  
Cyclic Voltammetry ◽  
Humic Acids ◽  
Carbon Paste Electrode ◽  
Electrochemical Behavior ◽  
Carbon Paste ◽  
Paste Electrode

Electrochemical Behavior of the Antibiotic Minocycline and its Voltammetric Determination in Pharmaceutical Formulations at Carbon Paste Electrode

2019 ◽  
Vol 43 (1) ◽  
pp. 289-296 ◽  
Author(s):  
Michel Rafael S. Souza ◽  
Débora M. Aragão ◽  
RenÊ Humberto T. Santos ◽  
Carlos Alexandre B. Garcia ◽  
José Patrocínio H. Alves ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Electrochemical Behavior ◽  
Pharmaceutical Formulations ◽  
Voltammetric Determination ◽  
Carbon Paste ◽  
Paste Electrode

scholarly journals A new electrochemical sensor based on carbon paste electrode/Ru(III) complex for determination of nitrite: Electrochemical impedance and cyclic voltammetry measurements

Measurement ◽  
2016 ◽  
Vol 92 ◽  
pp. 524-533 ◽  
Author(s):  
Achour Terbouche ◽  
Siham Lameche ◽  
Chafia Ait-Ramdane-Terbouche ◽  
Djamila Guerniche ◽  
Djahida Lerari ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Sensor ◽  
Carbon Paste Electrode ◽  
Electrochemical Impedance ◽  
Carbon Paste ◽  
Paste Electrode

A Facile In-Situ Development of L-Valine Film onto the Surface of Carbon Paste Electrode Towards the Detection of Environmentally Hazardous 4-Amino Phenol

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
T. Venu Gopal ◽  
Tukiakula Madhusudana Reddy ◽  
P. Shaikshavali ◽  
G. Venkataprasad ◽  
P. Gopal
Keyword(s):  
Cyclic Voltammetry ◽  
Carbon Paste Electrode ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Small Scale ◽  
Carbon Paste ◽  
Relative Standard ◽  
Paste Electrode

Abstract A small scale of environmentally hazardous 4-aminophenol can show significant impact on human health. Hence, in the present work, we have designed L-Valine film (Vf) modified carbon paste electrode (Vf/CPE) for the determination of 4-aminophenol. Herein, a facile in-situ L-Valine film was developed by electrochemical polymerization method onto the surface of bare carbon paste electrode (BCPE) with the help of cyclic voltammetry (CV) technique. A two-folds of electrochemical peak current enhancement was achieved at Vf/CPE in comparison with BCPE towards the determination of 4-aminophenol in optimum pH 7.0 of phosphate buffer solution (PBS). This was achieved due to the large surface area and conductive nature of Vf/CPE, which was concluded through the techniques of cyclic voltammetry and electrochemical impedance spectroscopy (EIS). The effect of pH of buffer and scan rate studies were successfully studied. Morphological changes of BCPE and Vf/CPE was studied with the help of scanning electron microscopy (SEM). The formation of Vf on CPE was also analyzed by Fourier transform infrared (FTIR) spectra. Under the optimized conditions, the limit of detection (LOD) and limit of quantification (LOQ) values of 4-aminophenol were estimated with the aid of chronoamperometry (CA) technique and was found to be 9.8 μM and 32 μM, respectively. Finally the proposed method was found to have satisfactory repeatability, reproducibility and stability results with low relative standard deviation (RSD) values.

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