Anodic Stripping Voltammetric Determination of Lead(II) Using Glassy Carbon Electrode Modified with Novel Calix[4]arene

A new glassy carbon electrode modified with novel calix arene derivative was prepared and then applied to the selective recognition of lead ion in aqueous media by cyclic and square wave voltammtry. A new anodic stripping peak at -0 92 V (vs. Ag/Ag +) in square wave voltammogram can be obtained by scanning the potential from -1 5 to -0 6 V, of which the peak current is proportional to the concentration of Pb 2+ . The modified electrode in 0 1 mol/L HNO 3 solution showed a linear voltammetric response in the range of 2 0×10 -8 -1 0×10 -6 mol/L and a detection limit of 6 1×10 -9 mol/L. In the modified glassy carbon electrode no significant interference occurred from alkali, alkaline and transition metal ions except Hg 2+ , Ag + and Cu 2+ ions, which can be eliminated by the addition of KSCN. The proposed method was successfully applied to determine lead in aqueous samples.