Trace level determination of cadmium and lead in coffee (Coffea) using gold nanoparticles modified graphene paste electrode
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Kuupäev
2019
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Abstrakt
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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gold nanoparticles, graphene, heavy metals, coffee, voltammetry, articles