Determination of Copper(II) and Cadmium(II) in Rice Samples by Anodic Stripping Square Wave Voltammetry Using Reduced Graphene Oxide/Polypyrrole Composite Modified Screen-printed Carbon Electrode

Ploypailin Petsawi, Patrawadee Yaiwong, Rawiwan Laocharoensuk and Kontad Ounnunkad*
* Author for corresponding; e-mail address: suriyacmu@yahoo.com
Volume: Vol.46 No.2 (March 2019)
Research Article
DOI:
Received: 16 July 2018, Revised: -, Accepted: 17 August 2018, Published: -

Citation: Petsawi P., Yaiwong P. and Ounnunkad R.L.A., Determination of Copper(II) and Cadmium(II) in Rice Samples by Anodic Stripping Square Wave Voltammetry Using Reduced Graphene Oxide/Polypyrrole Composite Modified Screen-printed Carbon Electrode, Chiang Mai Journal of Science, 2019; 46(2): 322-336.

Abstract

In this work, a polypyrrole (PPy)/reduced graphene oxide (rGO) composite has been used to develop an electrochemical sensor for quantification of trace Cu(II) and Cd(II) in rice samples via square-wave anodic stripping voltammetry (SWASV). To fabricate the sensor, PPy/rGO was deposited on a screen-printed carbon electrode (SPCE) by simple drop casting. The detection of such two heavy metals by SWASV method was achieved by optimizing some parameters such as materials composition, pH of electrolyte, the deposition time and the deposition potential. As a result, the modified electrode with PPy/rGO nanocompsite exhibited reproducible response, high sensitivity and good stability for Cd(II) and Cu(II) ions. Under optimal conditions, it provided high sensitivity, wide linear ranges (0.10 to 500.0 gL-1 and 500 to 5000 mgL-1) with low detection limits (for Cu(II) 0.064 gL-1 and for Cd(II) 0.097 gL-1), and had excellent repeatability and good recoveries (94% to 117%). This proposed PPy/rGO sensor was used to the determination of copper and cadmium in rice samples.

Keywords: graphene, polypyrrole, screen-printed carbon electrode, stripping voltammetry

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