Cathodic Stripping Voltammetric Determination of Tellurium(IV) with in situ Plated Bismuth-Film Electrode

• Published in: Analytical letters Vol. 42; no. 13; pp. 1997 - 2010
• Main Authors: Zong, Ping, Nagaosa, Yukio
• Format: Journal Article
• Language: English
• Published: Philadelphia, PA Taylor & Francis Group 01.01.2009; Taylor & Francis
• Subjects: Analytical chemistry; Bismuth-film electrode; Catalysis; Catalysts; catalytic hydrogen wave; Chemistry; Deposition; edge-plane graphite; Electrochemical methods; Electrodes; Exact sciences and technology; Mathematical analysis; square-wave cathodic stripping voltammetry; Standard deviation; Stripping; tellurium(IV); Voltammetry; Trace analysis; Water; Catalytic reaction; Peak resolution; Tellurium IV; Hydrogen; In situ; tellurium(IV); Replica method; square-wave cathodic stripping voltammetry; Cathodic stripping voltammetry; Bismuth-film electrode; Bismuth III; Thin layer electrode; Detection limit; Graphite; edge-plane graphite; catalytic hydrogen wave; Standard deviation; Square wave
• ISSN: 0003-2719; 1532-236X
• DOI: 10.1080/00032710903082770

A very sensitive and reliable method is proposed for the determination of tellurium(IV) [Te(IV)] by Osteryoung square-wave cathodic stripping voltammetry. This method is based on the reduction of Te(IV) with bismuth(III) onto an edge-plane pyrolytic graphite electrode, followed by a cathodic potential scan. The reduced Te gave a well-defined catalytic hydrogen wave at −1200 mV vs. Ag/AgCl. The peak height of the catalytic wave was directly proportional to the initial Te(IV) concentration in the concentration ranges of 0.01-0.10 and 0.1-1.0 µg L −1 with 30 s deposition time. A 3σ detection limit of 1.0 ng L −1 Te(IV) was obtained with the same deposition time. The relative standard deviation was 3% on replicate runs (n = 5) for the determination of 0.1 µg L −1 Te(IV). Analytical results of natural water samples demonstrate that the proposed method is applicable to the determination of traces of Te(IV).