Dual-signal anodic stripping voltammetric determination of trace arsenic(III) at a glassy carbon electrode modified with internal-electrolysis deposited gold nanoparticles |
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| Affiliation: | 1. Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081 China;2. Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycling, Nanchang Hangkong University, Nanchang 330063 China;1. Nanomaterials and Solar Energy Conversion Lab, Department of Chemistry, National Institute of Technology, Trichy, India;2. Department of Electrical Engineering, College of Engineering, Najran University, Najran 11001, Saudi Arabia |
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| Abstract: | A glassy carbon electrode (GCE) modified with internal-electrolysis deposited gold nanoparticles (AuNPsied) was applied to sensitively and selectively detect As(III) by anodic stripping linear sweep voltammetry (ASLSV). The AuNPsied/GCE was prepared based on the redox replacement reaction between a supporting-electrolyte-free aqueous HAuCl4 and a copper sheet in saturated KCl separated by a salt bridge. Under optimum conditions (0.5 M aqueous H2SO4, 300-s preconcentration at − 0.4 V), the ASLSV peak current for the As(0)–As(III) oxidation responded linearly to As(III) concentration from 0.02 to 3 μM with a limit of detection (LOD) of 0.9 nM (0.07 μg L− 1) (S/N = 3), while that for the As(III)–As(V) oxidation was linear with As(III) concentration from 0.02 to 1 μM with a LOD of 4 nM (0.3 μg L− 1) (S/N = 3). An appropriate high-scan-rate for ASLSV can enhance both the sensitivity and signal-to-noise ratio. This method was applied for analyses of As(III) in real water samples. |
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