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

摘要

A new glassy carbon electrode modified with novel calix[4]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 -1.6 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~(2+) 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.