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2016-04-06

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cc-by-nc-nd (c) Elsevier B.V., 2016
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/139423

Determination of Sb(III) using an ex-situ bismuth screen-printed carbon electrode by adsorptive stripping voltammetry

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Recurs relacionat

https://doi.org/10.1016/j.talanta.2016.04.015

Resum

The determination of Sb(III) on an ex-situ bismuth screen-printed carbon electrode (ex-situ BiSPCE) by means of adsorptive stripping voltammetry (AdSV) using quercetin-5′-sulfonic acid as chelating agent was optimized. The effect of different experimental parameters such pH, ligand concentration (CQSA), accumulation potential (Eacc) and accumulation time (tacc) were studied to obtain a wide linear range, the highest sensitivity and the lowest detection limit. Ex-situ BiSPCE was analytically compared with a sputtered bismuth screen-printed electrode (BispSPE) under optimal conditions. The obtained analytical parameters suggest that ex-situ BiSPCE behaves much better than BispSPE and the first was selected for this study. Optimal parameters were pH=4.6; CQSA=10.0 to 20.0×10−6 mol L−1; Eacc=−0.5 V and tacc=60 s. Peak area is proportional to Sb(III) concentration up to 100.0 μg L−1 (tacc 60 s) and 45.0 μg L−1 (tacc 120 s) range, with detection limits of 1.2 μg L−1 (tacc 60 s) and 0.8 μg L−1 (tacc 120 s). The relative standard deviation for a Sb(III) solution (20.0 μg L−1) was 3.9% for ten successive assays. Thus, the effect of various interfering metal ions was studied and the methodology was validated using a spiked groundwater reference material with very satisfactory results.

Matèries

Voltametria, Electroquímica, Anàlisi electroquímica

Matèries (anglès)

Voltammetry, Electrochemistry, Electrochemical analysis

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Articles publicats en revistes (Enginyeria Química i Química Analítica)

Citació

ROJAS-ROMO, Carlos, et al. Determination of Sb(III) using an ex-situ bismuth screen-printed carbon electrode by adsorptive stripping voltammetry. Talanta. 2016. Vol. 155, num. 21-27. ISSN 0039-9140. [consulted: 28 of August of 2026]. Available at: https://hdl.handle.net/2445/139423

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