Background: This study is aimed at evaluating the content of mercury in 17 samples of beauty
creams. These beauty creams have been procured from local market.
Objective: The potential use of graphene modified glassy carbon electrode in electrochemical detection
of mercury ions present in beauty cream samples has been demonstrated. The content of Hg was measured
by electrochemical method.
Method: The analyses were preceded by acid digestion of the creams and Scanning Electron Microscope
and Raman spectroscopy was used for characterization of the samples. The quantification of Hg
was performed by graphene modified glassy carbon electrode. The presence of graphene sheets on the
glassy carbon electrode greatly enhanced the electrochemical response for mercury.
Results: The electrode’s performance was accurate and sensitive for the detection of mercury ions in
real samples. Cyclic Voltametry measurements showed a well-defined HgCl2 redox peaks present in
control. Detection of Hg2+ was achieved in the range of 5 mM to 10-7mM with a limit of detection of 10-
6 mM. The performance of the electrode was also studied by recording nyquist plot for the sample cream
which showed the maximum presence of Hg2+.
Conclusion: The results of the creams showing the presence of mercury were also confirmed by the
Atomic Absorption Spectroscopy (AAS).Therefore, our method is potentially suitable for routine mercury
ions sensing in beauty cream samples. The fabricated device shows good electronic stability, excellent
lower detection limit and high sensitivity for real-time detection of Hg2+ in beauty creams.