Fig. 8From: Fabrication of novel polymer-modified graphene-based electrochemical sensor for the determination of mercury and lead ions in water and biological samplesa Plot of the oxidation peak current as a function of concentration of HgCl2 in 0.1 M PBS (pH 4.5) at the scan rate of 0.1 V/s. b Plot of the oxidation peak current as a function of the concentration of PbCl2 in 0.1 M PBS (pH 4.5) at the scan rate of 0.1 V/sBack to article page