title: Determination of Sb(III) using an ex-situ bismuth screen-printed carbon electrode by adsorptive stripping voltammetry.
abstract: 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)molL(-1); Eacc=-0.5V and tacc=60s. Peak area is proportional to Sb(III) concentration up to 100.0μgL(-1) (tacc 60s) and 45.0μgL(-1) (tacc 120s) range, with detection limits of 1.2μgL(-)(1) (tacc 60s) and 0.8μgL(-1) (tacc 120s). The relative standard deviation for a Sb(III) solution (20.0μgL(-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.
authors.affiliation: Departament de Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain; Facultad de Química, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago 7820436, Chile.
authors.forename: Carlos
authors.initials: C
authors.lastname: Rojas-Romo
authors.affiliation: Departament de Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain. Electronic address: nuria.serrano@ub.edu.
authors.forename: Núria
authors.initials: N
authors.lastname: Serrano
authors.affiliation: Departament de Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain.
authors.forename: Cristina
authors.initials: C
authors.lastname: Ariño
authors.affiliation: Facultad de Química, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago 7820436, Chile.
authors.forename: Verónica
authors.initials: V
authors.lastname: Arancibia
authors.affiliation: Departament de Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain.
authors.forename: José Manuel
authors.initials: JM
authors.lastname: Díaz-Cruz
authors.affiliation: Departament de Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain.
authors.forename: Miquel
authors.initials: M
authors.lastname: Esteban
keywords: Adsorptive stripping voltammetry; Bismuth film electrode; Determination of antimony; Quercetin-5′-sulfonic acid; Screen-printed electrode