Determination of heavy metals at the electrochemically reduced graphene oxide mercury film electrode (ERGO-HgF-PGE) using adsorptive stripping voltammetry
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Date
2020
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Publisher
University of Western Cape
Abstract
This work reports the use of a pencil graphite electrode (PGE) as inexpensive and sensitive
electrochemical sensing platform fabricated by using electrochemically reduced graphene oxide
(ERGO) in conjunction with an in-situ plated thin mercury film. For the first time the ERGOHgF-PGE sensor is proposed for simultaneous detection of cadmium (Cd2+), copper (Cu2+), lead
(Pb2+) and zinc (Zn2+) using N-Nitroso-N-phenylhydroxylamine (cupferron) as complexing agent
by square-wave adsorptive cathodic stripping voltammetry (SW-AdCSV). The technique is
based on the adsorption of cupferron- metal ion complexes onto the surface of the ERGO-HgFPGE at 0.1 V for 60 s carried out in 0.1 M acetate buffer solution (pH 4.6). The synthesized
graphene oxide (GO) and graphene nanosheets (GNs) were characterized using different
analytical techniques such as FT-IR which confirms the presence of oxygen moieties embedded
in the graphitic structure and further demonstrated by UV-Vis, validating the synthesis of GO
Description
>Magister Scientiae - MSc
Keywords
Cupferron, Graphene, Pencil graphite electrode (PGE), Thin mercury film, Trace metal analysis