Trace level determination of cadmium and lead in coffee (Coffea) using gold nanoparticles modified graphene paste electrode
College
College of Science
Department/Unit
Physics
Document Type
Article
Source Title
Agronomy Research
Volume
17
Issue
5
First Page
2029
Last Page
2039
Publication Date
1-1-2019
Abstract
© 2019, Eesti Pollumajandusulikool. All rights reserved. Gold nanoparticles (AuNP) modified graphene paste electrodes (GPE) were fabricated using graphene powder, gold nanoparticles, and mineral oil. The fabricated electrodes were used as working electrode in anodic stripping voltammetry (ASV) for the determination of trace concentrations of cadmium (Cd2+) and lead (Pb2+). The modified GPE was characterized using scanning electron microscopy and cyclic voltammetry. Optimization of the electrode’s AuNP content and the ASV parameters was performed. It was determined that the GPE modified with 0.5 mg AuNP obtained the highest anodic current peaks for both Cd2+ and Pb2+. The calibration curves obtained using the said electrode showed a linear relationship between heavy metal concentration and peak current and the detection limits were found to be 256 ppb for lead and 267 ppb cadmium. The modified electrode was successful in determining traces of Cd2+ and Pb2+ in coffee samples. The presence of the heavy metals in the samples were verified using atomic absorption spectroscopy.
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Digitial Object Identifier (DOI)
10.15159/AR.19.177
Recommended Citation
Palisoc, S. T., Leoncini, J., & Natividad, M. T. (2019). Trace level determination of cadmium and lead in coffee (Coffea) using gold nanoparticles modified graphene paste electrode. Agronomy Research, 17 (5), 2029-2039. https://doi.org/10.15159/AR.19.177
Keywords
Coffee—Heavy metal content; Nanoparticles; Voltammetry
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