TITLE

A copper ion-selective electrode with high selectivity prepared by sol-gel and coated wire techniques

AUTHOR(S)
Ardakani, M. Mazloum; Salavati-Niasari, M.; Kashani, M. Khayat; Ghoreishi, S. M.
PUB. DATE
March 2004
SOURCE
Analytical & Bioanalytical Chemistry;Mar2004, Vol. 378 Issue 6, p1659
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A sol-gel electrode and a coated wire ion-selective poly(vinyl chloride) membrane, based on thiosemicarbazone as a neutral carrier, were successfully developed for the detection of Cu (II) in aqueous solutions. The sol-gel electrode and coated electrode exhibited linear response with Nernstian slopes of 29.2 and 28.1 mV per decade respectively, within the copper ion concentration ranges 1.0×10-5–1.0×10-1 M and 6.0×10-6–1.0×10-1 M for coated and sol-gel sensors. The coated and sol-gel electrodes show detection limits of 3.0×10-6 and 6.0×10-6 M respectively. The electrodes exhibited good selectivities for a number of alkali, alkaline earth, transition and heavy metal ions. The proposed electrodes have response times ranging from 10–50 s to achieve a 95% steady potential for Cu2+ concentration. The electrodes are suitable for use in aqueous solutions over a wide pH range (4–7.5). Applications of these electrodes for the determination of copper in real samples, and as an indicator electrode for potentiometric titration of Cu2+ ion using EDTA, are reported. The lifetimes of the electrodes were tested over a period of six months to investigate their stability. No significant change in the performance of the sol-gel electrode was observed over this period, but after two months the coated wire copper-selective electrode exhibited a gradual decrease in the slope. The selectivity of the sol-gel electrode was found to be better than that of the coated wire copper-selective electrode. Based on these results, a novel sol-gel copper-selective electrode is proposed for the determination of copper, and applied to real sample assays.
ACCESSION #
15124953

 

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