Development of Differential Pulse Anodic Stripping Voltammetry Technique for Cadmium(II) Detection and Its Application in Water Spinach

Cadmium is a toxic pollutant that is harmful to the environment and humans. The purpose of this research was to develop a method for cadmium(II) detection using differential pulse anodic stripping voltammetry (DPASV) using a glassy carbon electrode. The developed method was then applied for cadmium detection in the vegetable samples which is water spinach. The developed method was optimized in several parameters such as potential window, deposition potential, deposition time, and scan rate. The developed method for cadmium(II) detection was also investigated in its analytical performance includes linearity, precision, detection limit, and quantitation limit. The optimum conditions for cadmium(II) detection in 0.1 M KCl using DPASV technique obtained such as potential window from -1200 to -100 mV, deposition potential of -1100 mV (vs Ag/AgCl), and deposition time of 360 s. It was obtained good linearity for cadmium(II) detection using the DPASV technique with an R2 of 0.996. The precision was expressed as %SBR with 0.66%. The detection and quantitation limits for cadmium(II) detection were 0.4206 µM~0.0771 ppm and 0.5525 µM~0.1013 ppm, respectively. The developed method was then applied for cadmium(II) measurement in the water spinach sample and the obtained cadmium(II) concentration in water spinach was 0.2399 mg/Kg.

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Potentiometric stripping analysis vs. differential pulse anodic stripping voltammetry for copper(II) analysis at relatively positive deposition potential

Analytica Chimica Acta ◽

10.1016/0003-2670(94)00510-s ◽

1995 ◽

Vol 303 (2-3) ◽

pp. 255-263 ◽

Cited By ~ 8

Author(s):

Helena M.V.M. Soares ◽

M.Teresa S.D. Vasconcelos

Keyword(s):

Anodic Stripping Voltammetry ◽

Stripping Voltammetry ◽

Differential Pulse ◽

Deposition Potential ◽

Stripping Analysis ◽

Anodic Stripping ◽

Potentiometric Stripping Analysis

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Synergetic Sensing Effect of Sodium Carboxymethyl Cellulose and Bismuth on Cadmium Detection by Differential Pulse Anodic Stripping Voltammetry

Sensors ◽

10.3390/s19245482 ◽

2019 ◽

Vol 19 (24) ◽

pp. 5482 ◽

Cited By ~ 3

Author(s):

Jingheng Ning ◽

Xin Luo ◽

Faxiang Wang ◽

Shouen Huang ◽

Jianhui Wang ◽

...

Keyword(s):

Electrochemical Sensor ◽

Carboxymethyl Cellulose ◽

Limit Of Detection ◽

Tap Water ◽

Anodic Stripping Voltammetry ◽

Stripping Voltammetry ◽

Differential Pulse ◽

Sodium Carboxymethyl Cellulose ◽

Cadmium Detection ◽

Anodic Stripping

In the present work, a novel electrochemical sensor was developed for the detection of trace cadmium with high sensitivity and selectivity in an easy and eco-friendly way. Firstly, a glassy carbon electrode (GCE) was modified with nontoxic sodium carboxymethyl cellulose (CMC) by a simple drop-casting method, which was applied to detect cadmium by differential pulse anodic stripping voltammetry (DPASV) in a solution containing both target cadmium and eco-friendly bismuth ions, based on a quick electro-codeposition of these two metal ions on the surface of the modified electrode (CMC-GCE). Investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and Fourier transform infrared spectroscopy (FT-IR), both CMC (with good film-forming ability) and bismuth (with well-defined stripping signal) were found to be well complexed with target cadmium, leading to vital signal amplification for cadmium detection at a sub-nanomolar level. Under the optimal conditions, the proposed sensor exhibited a good linear stripping signal response to cadmium (Ⅱ) ion, in a concentration range of 0.001 μmol/L–1 μmol/L with a limit of detection of 0.75 nmol/L (S/N = 3). Meanwhile, the results demonstrate that this novel electrochemical sensor has excellent sensitivity and reproducibility, which can be used as a promising detection technique for testing natural samples such as tap water.

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