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@article{777273,
author = {Trnková, Libuše and Zerzánková, Lenka and Dyčka, Filip and Mikelová, Radka and Jelen, František},
article_number = {JAN 2008},
keywords = {copper-purine complexes; paraffin-impregnated graphite electrode; mercury-film electrode; anodic and cathodic stripping techniques; elimination voltammetry; confidence ellipse},
language = {eng},
issn = {1424-8220},
journal = {Sensors},
title = {Study of copper and purine-copper complexes on modified carbon electrodes by cyclic and elimination voltammetry},
url = {http://www.mdpi.org/sensors/papers/s8010429.pdf},
volume = {8},
year = {2008}
}
TY - JOUR
ID - 777273
AU - Trnková, Libuše - Zerzánková, Lenka - Dyčka, Filip - Mikelová, Radka - Jelen, František
PY - 2008
TI - Study of copper and purine-copper complexes on modified carbon electrodes by cyclic and elimination voltammetry
JF - Sensors
VL - 8
IS - JAN 2008
SP - 428-443
EP - 428-443
SN - 14248220
KW - copper-purine complexes
KW - paraffin-impregnated graphite electrode
KW - mercury-film electrode
KW - anodic and cathodic stripping techniques
KW - elimination voltammetry
KW - confidence ellipse
UR - http://www.mdpi.org/sensors/papers/s8010429.pdf
N2 - Using a paraffin impregnated graphite electrode (PIGE) and mercury-modified pyrolytic graphite electrode with basal orientation (Hg-PGEb) copper(II) and Cu(II)-DNA purine base solutions have been studied by cyclic (CV) and linear sweep voltammetry (LSV) in connection with elimination voltammetry with linear scan (EVLS). In chloride and bromide solutions (pH 6), the redox process of Cu(II) proceeded on PIGE with two cathodic and two anodic potentially separated signals. According to the elimination function E4, the first cathodic peak corresponds to the reduction Cu(II) + e(-) -> Cu(I) with the possibility of fast disproportionation 2Cu(I) -> Cu(II)+ Cu(0). The E4 of the second cathodic peak signalized an electrode process controlled by a surface reaction. The electrode system of Cu(II) on Hg-PGEb in borate buffer (pH 9.2) was characterized by one cathodic and one anodic peak. Anodic stripping voltammetry (ASV) on PIGE and cathodic stripping voltammetry (CSV) on Hg-PGEb were carried out at potentials where the reduction of copper ions took place and Cu(I)-purine complexes were formed. By using ASV and CSV in combination with EVLS, the sensitivity of Cu(I)-purine complex detection was enhanced relative to either ASV or CSV alone, resulting in higher peak currents of more than one order of magnitude. The statistical treatment of CE data was used to determine the reproducibility of measurements. Our results show that EVLS in connection with the stripping procedure is useful for both qualitative and quantitative microanalysis of purine derivatives and can also reveal details of studied electrode processes.
ER -
TRNKOVÁ, Libuše, Lenka ZERZÁNKOVÁ, Filip DYČKA, Radka MIKELOVÁ a František JELEN. Study of copper and purine-copper complexes on modified carbon electrodes by cyclic and elimination voltammetry. \textit{Sensors}. 2008, roč.~8, JAN 2008, s.~428-443. ISSN~1424-8220.
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