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  • Antimony powder-modified carbon paste electrodes for electrochemical strippingdetermination of trace heavy metals
    Tesařová, Eva ...
    A new type of the antimony electrode based on a carbon paste bulk-modified with antimony powder (Sb-CPE) is presented for the determination of cadmium(II) and lead(II) ions at the microgram-per-liter ... concentration level, when using square-wave anodic stripping voltammetric or stripping chronopotentiometric protocol. The Sb-CPE was prepared by mixing fine antimonypowder, carbon powder, and silicon oil, thus combining typical features of the carbon paste material with specific electrochemical propertiesof antimony. Key-operational parameters, including the amount of antimony powder in the carbon paste mixture, effect of the deposition potential and deposition time, were optimized and electroanalytical performance of the Sb-CPE in nondeaerated solution of 0.01 M hydrochloric acid(pH 2) was compared with related bismuth powder-modified carbon paste electrode (Bi-CPE) and with in situ prepared antimony film carbon paste electrode (SbF-CPE). The electrode of interest exhibited well-developed signals and highly linear calibration plots for both metal ions tested. In addition, favorable limits of detection were achieved; namely: 1.4 g L-1 for Cd(II) and 0.9 g L-1 for Pb(II). The applicability of the new electrode was demonstrated on the analysis of tap water (spiked sample). Besides voltammetric measurements, the Sb-CPE was preliminary tested also under chronopotentiometric stripping mode in deoxygenated solutions, revealing also an excellent electroanalytical performance.
    Vir: Electrochimica Acta. - ISSN 0013-4686 (Vol. 56, no. 19, 2011, str. 6673-6677)
    Vrsta gradiva - članek, sestavni del
    Leto - 2011
    Jezik - angleški
    COBISS.SI-ID - 4682778
    DOI

vir: Electrochimica Acta. - ISSN 0013-4686 (Vol. 56, no. 19, 2011, str. 6673-6677)
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