ISSN:
1040-0397
Keywords:
Copper
;
Triton X-100
;
Voltammetry
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The influence of Triton X-100 (T-X-100) on the redox processes of copper in NaCl solutions and in the presence of oxygen was investigated by anodic stripping alternating current voltammetry (ASacV), anodic stripping direct current voltammetry (ASdcV), and differential pulse anodic stripping voltammetry (DPASV). In the presence of oxygen, copper dissolution from amalgam is characterized by a catalytic process, resulting in a net cathodic current due to the oxidation of Cu(I) to Cu(II) by H2O2 formed on the electrode, and the subsequent reduction of Cu(II) back to Cu (I). Triton X-100 blocks the catalytic process by hindering the formation of H2O2, by competing with CuCl2- and Cl- for the adsorption sites on HMDE surface, and by blocking the formation of Cu(I) and Cu(II) hydroxide deposit on the surface. Its presence also changes the redox processes of copper from reversible to quasireversible. At the same time, T-X-100 increases the oxidation current of copper, probably through disproportionation of Cu(I) to Cu(0) and Cu(II). This last effect was observed regardless of whether oxygen was present in the solutions or not.
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/elan.1140060210
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