Determination of Chromium(VI) with Screen‐Printed Ex‐Situ Bismuth Film Electrodes by Adsorptive Stripping Voltammetry
Year: 2024
Type: article
Abstract: 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) as complexing agent. The method is based on the oxidation of PGR by Cr(VI) and posterior complexation with Cr(III). To obtain a 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 prepared ex–situ were pH 4.5 (0.01 mol L−1 acetic acid/acetate buffer), CPGR: 2.6 μmol L−1, Eacc: −0.70 V and tacc: 60 s. Peak current is proportional to Cr(VI) concentration over the range 0.23–12.0 μg L−1, with a 3σ detection limit of 0.97 μg L−1. The method was validated by determining Cr(VI) in tap water spiked with Cr(VI) and Cr(III).
Source: Electroanalysis
Institutions: University of Chile, Universitat de Barcelona
Language: English
Subfield: Electrochemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4402531252