Electrochemical Redox of Arsenic (Iii) and Cu (Ii) Mixtures with Ultraflat Au(111) Thin Films in Water

• DOI: 10.2139/ssrn.4558583
• Publication Date: 2023-09-01T08:18:25Z
• Authors: Tybur Casuse; Angelica Benavidez; Noah Jemison; Jose M. Cerrato; Juan Miguel Feliu; Fernando Garzon

The ability to detect trace concentrations of arsenite, As (III), in real water solutions is impacted by co-contamination other metals and co-occurring ions. presence copper ions, specifically Cu (II), the most concerning common co-contaminant natural waters due close proximity (II) oxidation potential that (III). use well-oriented ultraflat Au(111) thin film electrodes provided increased peak separation sensitivity for electrochemical deposition (III) 0.5 M sulfuric acid compared an Au wire electrode. However, mixtures yielded new properties during both cyclic voltammetry (CV) linear stripping (LSV) analysis. Sweeping at 10 mV s-1 CV & resulted a sequential condition where layer blocked effective In contrast, stepping 0 V reduction occurs, produced profile different from alone, significantly larger increase coulombic efficiency. Ex-situ analysis using X-ray photoelectron spectroscopy showed mixture was co-adsorbed onto surface after 60 seconds V, indicating occurrence alloying process. Trace calibration curves standard additions method were conducted Cu, As, + solutions. This study provides detailed insights into electrode surfaces LSV impacts Cu-As on detection H2SO4