Fig. 5From: Fabrication of novel polymer-modified graphene-based electrochemical sensor for the determination of mercury and lead ions in water and biological samplesCyclic voltammograms of 1 mM PbCl2 at BGPE (curve b) and PGMGPE (curve a) in 0.1 M PBS (pH 4.5) at a scan rate of 0.1 V/sBack to article page