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Abstract
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Graphene, a new class of 2D carbon nanomaterials with one atom thickness, has attracted
considerable attention in recent years (1). Eggshell membrane is cheap, green and easily
achieved biopolymers which have been used frequently in analytical science (2). In the present
study, reduced graphene oxide is doped efficiently into the soluble eggshell membrane protein
(RGO-SEP) and the resultant biocomposite is introduced as a novel and effective nano-sorbent in
SPE for the preconcentration of Hg2+. In order to increase the sensitivity and detection limit of
the developed method, anodic stripping voltammetry (ASV) technique was used as a detection
method. The scheme of the preconcentration and determination process was shown in scheme 1.
Here Hg2+ was preconcentrated in two steps:
first in SPE process which Hg2+ preconcentrated according to enrichment factor; second in ASV
technique which Hg2+ accumulates on the electrode surface. Thus the developed method is very
sensitive, cost effective, and green in comparison with other reported techniques.
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