Detection of Cd2+ by Square Wave Anodic Stripping Voltammetry Using an Activated Bismuth-film Electrodes

doi:10.15541/jim20180169

Abstract

Abstract:

The stripping current arising from the oxidation of Cd was related to the concentration of Cd²⁺ in the sample. This study presents the determination of Cd(II) at low concentration μg/L levels by square wave anodic stripping voltammetry (SWASV) on an activated bismuth-film electrode (BFE). The electrode was initially modified by an electrochemical method, and then the electrodeposited bismuth-film was prepared again to improve the electrode, thereby enhancing the sensitivity to trace amounts of target Cd²⁺. The surface of glassy carbon electrode (GCE) before and after modification was characterizad by SEM, CV, EIS, and SWV. The parameters for the determination of the Cd²⁺ were investigated with the view of its application toward real samples containing low concentrations of Cd²⁺. Using the selected conditions, the limit of detection is 1 μg/L for Cd²⁺ at a preconcentration time of 10 min.

Key words: bismuth-film, anodic stripping voltammetry, chemically modified electrode, electrochemical detection, Cd²⁺

CLC Number:

TQ174

YAO Mei-Na, YANG Xian-Jin, CUI Zhen-Duo, ZHU Sheng-Li, LI Zhao-Yang, LIANG Yan-Qin. Detection of Cd²⁺ by Square Wave Anodic Stripping Voltammetry Using an Activated Bismuth-film Electrodes[J]. Journal of Inorganic Materials, 2019, 34(1): 91-95.

Figures/Tables 4

Fig. 1 SEM images of the three Electrodes (a) I; (b) Ⅱ; (c) Ⅲ

Fig. 2 (A) Cyclic voltammograms of 5 mmol/L [Fe(CN)6]3-/4- in 0.1 mol/L KCl: (a) GCE, (b) activated GCE, (c) Bi/GCE and (d) activated Bi/GCE (Scan rate: 50 mV/s); (B) Nyquist plots of different electrodes under the same conditions

Fig. 3 Effect of Bi(III) concentration on the stripping peak current of Cd(II) using activated Bi/GCE

Fig. 4 (A) Square-wave anodic stripping voltammograms for different concentrations of Cd(II) on the bismuth-film electrode, (B) the linear calibration curves of Cd2+

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Detection of Cd²⁺ by Square Wave Anodic Stripping Voltammetry Using an Activated Bismuth-film Electrodes

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