Structural study and electrochemical behavior of KPb4‐xCdx(PO4)3 (0≤x≤2) in capturing mercury (II) at graphite electrode

Abstract

A novel mercury (II) sensor was developed by modifying carbon paste electrode by anion‐deficient apatite. The later was synthesized using solid reaction and characterized with XRD, FTIR, Raman and electrochemical techniques. The refinement results with Rietveld method shows good agreement between the experimental and calculated XRD patterns with satisfactory reliability factors. All experimental variables involved in the differential pulse anodic stripping voltammetric (DPASV) method were optimized to develop a reliable method to measure low concentration of mercury (II). The interference experiments show that Ag (I), Pb (II), Cd (II), Fe (II) and Cu (II) had little or no influence on the Hg (II) signal. Moreover, the prepared electrode revealed good repeatability. The practicability of proposed method for the determination of Hg (II) in fish and seawater samples has shown the satisfactory results.

Keywords

• Lacunar apatite
• Rietveld method
• differential pulse anodic stripping voltammetry
• seawater and fish