2026-04-17T06:46:58Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2215332026-01-01T19:12:31Zcom_2072_1057col_2072_478813col_2072_478917

RECERCAT author Triviño, Juan José author Esteban i Cortada, Miquel author Díaz Cruz, José Manuel author Serrano i Plana, Núria author Alvarez-Lueje, Alejandro author Arancibia, Verónica 2025-06-13T16:44:33Z2025-12-31T06:10:41Z2025-01-012025-06-13T16:44:33Z This work presents a fast and sensitive method, with an ex–situ bismuth film screen-printed carbon electrode (ex–situ Bi–SPCE), for the determination of Cr(VI) through adsorptive stripping voltammetry (AdSV) using Pyrogallol Red (PGR) ascomplexing agent. The method is based on the oxidation of PGR by Cr(VI) and posterior complexation with Cr(III). To obtaina sensitive and selective method, the effects of various parameters such as pH, ligand concentration of PGR (CPGR),accumulation potential, and accumulation time (Eacc, tacc) were optimized. The optimal conditions using Bi–SPCE preparedex–situ were pH 4.5 (0.01 molL-1 acetic acid/acetate buffer), CPGR: 2.6 μmolL-1, Eacc: - 0.70 V and tacc: 60 s. Peak current isproportional to Cr(VI) concentration over the range 0.23–12.0 μgL-1, with a 3σ detection limit of 0.97 μgL-1. The method wasvalidated by determining Cr(VI) in tap water spiked with Cr(VI) and Cr(III). (c) Wiley-VCH, 2025 info:eu-repo/semantics/openAccess Adsorció Voltametria Crom Adsorption Voltammetry Chromium Determination of chromium(VI) with screen-printed ex-situ bismuth film electrodes by adsorptive stripping voltammetry info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion