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oai:recercat.cat:2445/1394232025-12-04T19:34:52Zcom_2072_1057col_2072_478813col_2072_478917

urn:hdl:2445/139423 Determination of Sb(III) using an ex-situ bismuth screen-printed carbon electrode by adsorptive stripping voltammetry Rojas-Romo, Carlos Serrano i Plana, Núria Ariño Blasco, Cristina Arancibia, Verónica Díaz Cruz, José Manuel Esteban i Cortada, Miquel Voltametria Electroquímica Anàlisi electroquímica Voltammetry Electrochemistry Electrochemical analysis 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. 2019-09-06T07:42:46Z 2019-09-06T07:42:46Z 2016-04-06 2019-09-06T07:42:47Z info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Versió postprint del document publicat a: https://doi.org/10.1016/j.talanta.2016.04.015 Talanta, 2016, vol. 155, p. 21-27 https://doi.org/10.1016/j.talanta.2016.04.015 cc-by-nc-nd (c) Elsevier B.V., 2016 http://creativecommons.org/licenses/by-nc-nd/3.0/es info:eu-repo/semantics/openAccess Elsevier B.V. Articles publicats en revistes (Enginyeria Química i Química Analítica)