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

Abstract

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.