Determination of cadmium with a sequential injection lab-on-valve by anodic stripping voltammetry using a nafion coated bismuth film electrode |
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Authors: | Yang Wang Zaiqing Liu Guojun Yao Peihua Zhu Xiaoya Hu Qin Xu |
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Institution: | a College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China b The Key Laboratory of Environmental Material and Engineering of Jiangsu Province, Yangzhou University, Yangzhou 225002, China |
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Abstract: | This work exploited a sequential injection lab-on-valve (LOV) system for the determination of cadmium by anodic stripping voltammetry (ASV). A miniaturized electrochemical flow cell (EFC) was fabricated in LOV, in which a nafion coated bismuth film electrode was used as working electrode. The cadmium was electrodeposited on the electrode surface in bismuth solution, and measured with the subsequential stripping scan. Under optimal conditions, the proposed system responded linearly to cadmium concentrations in a range 2.0-100.0 μg L−1. The detection limit of this method was found to be 0.88 μg L−1. By loading a sample volume of 800 μL, a sampling frequency of 22 determinations h−1 was achieved. The repeatability expressed as relative standard derivation (R.S.D.) was 3.65% for 20 μg L−1 cadmium (n = 11). The established method was applied to analysis of trace cadmium in environmental water samples and the spiked recoveries were satisfactory. |
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Keywords: | Sequential injection Lab-on-valve Cadmium Anodic stripping voltammetry Bismuth film electrode |
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