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Sensitive determination of lead by differential pulse anodic stripping voltammetry on silver-based coordination complex modified electrodes
- Wang, Yangjuan, Peng, Yuanping, Chen, Yifu, Du, Kejing, Li, Yijun, He, Xiwen
- Analytical methods 2016 v.8 no.8 pp. 1935-1941
- adsorption, analytical methods, coordination compounds, electrodes, lead, melamine, sensors (equipment), silver nitrate
- 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.