Sensitive determination of lead by differential pulse anodic stripping voltammetry on silver-based coordination complex modified electrodes

A silver-based coordination complex was synthesized from melamine (MA), terephthalic acid (TPA) and silver nitrate for the determination of Pb2+ at the trace level by differential pulse anodic stripping voltammetry (DPASV). The complex was identified as [Ag13(MA)10(TPA)5·10H2O]n and showed a good adsorption capability for Pb2+. Under the optimal conditions, the electrochemical sensor exhibited a linear response over the concentration range from 1.0 × 10−9 to 5.0 × 10−7 mol L−1 Pb(II) (R2 = 0.997) with a detection limit of 8.0 × 10−10 mol L−1 Pb(II) (S/N = 3). The method was successfully applied to real samples.