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Electro-chemical Stripping Analysis of Selected Heavy Metals at Antimony Trioxide-Modified Carbon Paste Electrode
Authors: Svobodová Eva | Baldrianová Lucie | Švancara Ivan | Hočevar Samo B.
Year: 2012
Type of publication: článek v odborném periodiku
Name of source: International Journal of Electrochemical Science
Publisher name: Electrochemical Science Group
Place: Belgrade
Page from-to: 197-210
Titles:
Language Name Abstract Keywords
cze Elektrochemická rozpouštěcí analýza vybraných těžkých kovů pomocí uhlíkové pastové elektrody modifikované oxidem antimonitým Uhlíková pastová elektroda modifikovaná oxidem antimonitým byla použita v anodické elektrochemické rozpouštěcí analýza jako nový typ nertuťové elektrody pro stanovení vybraných těžkých kovů. rozpouštěcí analýza; uhlíková pastová elektroda; oxid antimonitý
eng Electro-chemical Stripping Analysis of Selected Heavy Metals at Antimony Trioxide-Modified Carbon Paste Electrode Antimony trioxide-modified carbon paste electrode (Sb2O3-CPE) was developed and tested in combination with square-wave anodic stripping voltammetry as a new “mercury-free” sensor for the determination of selected heavy metal ions at the low ug L-1 concentration level. Measurements were carried out using non-deaerated solutions of 0.01 M HCl (pH 2) with Cd(II) + Pb(II) as model ions. Several important experimental parameters, e.g. deposition potential, deposition time, and the concentration of hydrochloric acid were studied and optimized, when the electroanalytical performance of the Sb2O3-CPE was critically compared with bismuth trioxide-modified carbon paste electrode (Bi2O3-CPE), and with the in-situ prepared antimony film carbon paste electrode (SbF-CPE) using either 0.01 M HCl (pH 2.0) or 0.1 M CH3COOH + CH3COONa (pH 4.4) as the supporting media. In contrast to other configurations of antimony film-operated electrodes, the Sb2O3-CPE has exhibited well-defined anodic stripping signals also in acetate buffer, proving thus itself to be generally applicable in both mild and more acidic supporting media. The sensor of interest showed a fairly linear behaviour in the concentration range of 10-100 μg L-1, offering good reproducibility and favourable detection limits of about 1 μg L-1 for Cd(II) and of 0.7 μg L-1 Pb(II) in combination with 90 s accumulation. The practical applicability of the Sb2O3-CPE, when the electrode could also be applied in the stripping chronopotentiometric operating mode (with chemical oxidation), was demonstrated on the voltammetric determination of Cd(II) and Pb(II) in sample of tap water Stripping analysis; Heavy etals; Antimony trioxide; Carbon paste electrode

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