Paper Title:
Electrochemical Noise Analysis of Chalcopyrite Carbon Paste Electrodes by Acidithiobacillus ferrooxidans
  Abstract

The electrochemical response of chalcopyrite was studied using electrochemical noise analysis (ENA). The assay was carried out under constant aeration using 30 mL in two electrochemical cells containing iron-free mineral salts solution. These cells were initially monitored for 56 hours. After 72 hours, 7.25×1010 cells mL-1 of A. ferrooxidans strain LR were added in both cells and monitored until 128 h. Subsequent to this period, 0.927 mmol L-1 of silver ions and 400 mmol L-1 of chloride ions were added each one separately. Both conditions were monitored until 168 hours. According to results obtained, it was observed that Cl- ions addition induced an accelerated corrosion process. However, there is a tendency of the system to reach the stationary state due to repassivation of the electrodic surface. In the other side, the Ag+ addition contributed for the maintenance of the oxidant atmosphere, in spite of controversial effect caused by considerable variations in the Rn values, resulting in a instability in the chalcopyrite reactivity.

  Info
Periodical
Advanced Materials Research (Volumes 20-21)
Edited by
Axel Schippers, Wolfgang Sand, Franz Glombitza and Sabine Willscher
Pages
83-86
DOI
10.4028/www.scientific.net/AMR.20-21.83
Citation
D. G. Horta, D. Bevilaqua, H. A. Acciari, O. Garcia Jr., A.V. Benedetti, "Electrochemical Noise Analysis of Chalcopyrite Carbon Paste Electrodes by Acidithiobacillus ferrooxidans", Advanced Materials Research, Vols. 20-21, pp. 83-86, 2007
Online since
July 2007
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$32.00
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