Composite Electrodes Based on Carbon Materials Decorated with Hg Nanoparticles for the Simultaneous Detection of Cd(II), Pb(II) and Cu(II)

Monitoring water quality has become a goal to prevent issues related human health and environmental conditions. In this sense, the concentration of metal ions in sources is screened, as these are considered persistent contaminants. work, we describe implementation customized graphite electrodes decorated with two types Hg nanoparticles (Hg-NPs), optimized toward electrochemical detection Cd, Pb Cu. Here, combine Hg, well-known property form alloys other metals, nanoscale features Hg-NPs, resulting improved sensors towards analytes substantial reduction used amount. Hg-NPs were synthesized using poly(diallyldimethylammonium) chloride (PDDA) combined role reducing stabilizing agent, then appropriately characterized by means Transmission Electron Microscopy (TEM) Zeta Potential. The surface composite content was modified drop-casting prepared Hg-NPs. obtained nanocomposite morphologically Scanning (SEM), electrochemically Cyclic Voltammetry (CV) Electrochemical Impedance Spectroscopy (EIS). results show that Hg-NP-modified present better responses Cd(II), Pb(II) Cu(II) comparison bare electrode. Analytical performance evaluated square-wave anodic stripping voltammetry (SWASV), obtaining linear range 0.005–0.5 mg·L−1 for Cd2+, 0.028–0.37 Pb2+ 0.057–1.1 Cu2+. Real samples analyzed SWASV, showing good agreement recovery values inductively coupled plasma–mass spectrometry (ICP-MS) measurements.