دورية أكاديمية
Electrochemical redox of arsenic (III) and Cu (II) mixtures with ultraflat Au(111) thin films in water
| العنوان: | Electrochemical redox of arsenic (III) and Cu (II) mixtures with ultraflat Au(111) thin films in water |
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| المؤلفون: | Casuse-Driovínto, Tybur Q., Benavidez, Angelica, Jemison, Noah, Cerrato, José M., Feliu, Juan M., Garzon, Fernando H. |
| المساهمون: | Universidad de Alicante. Instituto Universitario de Electroquímica, Electroquímica de Superficies |
| بيانات النشر: | Elsevier |
| سنة النشر: | 2024 |
| المجموعة: | RUA - Repositorio Institucional de la Universidad de Alicante |
| مصطلحات موضوعية: | Arsenic, Copper, Electrochemical detection, Gold single crystals, Gold Thin Films, Water |
| الوصف: | The ability to detect trace concentrations of arsenite, As (III), in real water solutions is impacted by co-contamination of other metals and co-occurring ions. The presence of copper (II) ions are the most likely co-contaminant in natural waters to interfere with electrochemical As (III) detection, due to the close oxidation potentials of Cu (II) and As (III). The use of well-oriented ultraflat Au(111) thin film electrodes provided increased peak separation and sensitivity for electrochemical deposition and oxidation of Cu (II) and As (III) in 0.5 M sulfuric acid compared to an Au wire electrode. However, mixtures of Cu (II) and As (III) altered the oxidation peak positions during both cyclic voltammetry (CV) and linear stripping voltammetry (LSV) analysis. Calibration curves using the standard additions method in trace concentrations were conducted for Cu, As, and Cu & As solutions. Sweeping the potential at 10 mV s−1 during CV in Cu & As mixtures resulted in a sequential deposition condition where a layer of Cu inhibited co-deposition of As to the electrode. In contrast, the rapid potential stepping of LSV to a potential where Cu and As reduction simultaneously occurs produced a peak profile different from Cu or As alone. A larger oxidation peak during LSV was also observed when both Cu and As were present. X-ray photoelectron spectroscopy indicates a Cu-As alloy is formed on the surface after LSV deposition. SYNOPSIS: Analysis of Cu (II), As (III) and Cu (II) & As (III) mixtures suggests that a Cu3As intermetallic phase is formed during LSV which impacts trace As detection even in trace Cu conditions. This has important implications for the ability to determine As concentrations near the MCL of 10 µg L−1 in natural water systems which may contain Cu (II) and other co-contaminants. ; This material is based upon work supported by the National Science Foundation (NSF) Graduate Research Fellowship Program (GRFP) under Grant No. (DGE-1418062), University of New Mexico Center for Water and the ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | https://doi.org/10.1016/j.electacta.2024.144220Test; Electrochimica Acta. 2024, 489: 144220. https://doi.org/10.1016/j.electacta.2024.144220Test; 0013-4686 (Print); 1873-3859 (Online); http://hdl.handle.net/10045/142129Test |
| DOI: | 10.1016/j.electacta.2024.144220 |
| الإتاحة: | https://doi.org/10.1016/j.electacta.2024.144220Test http://hdl.handle.net/10045/142129Test |
| حقوق: | © 2024 Elsevier Ltd. ; info:eu-repo/semantics/restrictedAccess |
| رقم الانضمام: | edsbas.9E3310BD |
| قاعدة البيانات: | BASE |
| DOI: | 10.1016/j.electacta.2024.144220 |
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