Voltammetric determination of lead (II) ions at carbon paste electrode modified with banana tissue

Banana tissue contains materials with functional groups which have the ability to form complexes with metal ions. With this property, banana tissue was used as modifier of carbon paste electrode for voltammetric determination of lead ions in aqueous samples. The use of 0.01 M HCl as supporting electrolyte and 20% (w/w) modifier gave an optimum current response for lead (II) solution. Accumulation time of 6 min, accumulating solution of pH 5, deposition time of 300 sec and deposition potential of-1500 mV were found to give the best results in the analysis of lead (II). Multiple stripping of the used electrode successfully removed lead ions for the regeneration of the electrode. The banana modified carbon paste electrode exhibited a sensitivity of 2.81 μA/ppm and a limit of detection (LOD) of 0.10 mg L-1. © 2007 Asian Network for Scientific Information.