Lead Film Electrode Prepared with the Use of a Reversibly Deposited Mediator Metal in Adsorptive Stripping Voltammetry of Nickel

The paper presents the first report on application of a hybrid lead film electrode for the adsorptive stripping voltammetric determination of Ni(II) in the presence of nioxime as a complexing agent. The strategy to create a hybrid electrode is based on the combination of ex situ and in situ plating methods and the use of a reversibly deposited mediator metal (Zn) for the lead film formation. The surface morphology of a new sensor was characterized by atomic force microscopy. The detection limit for Ni(II) obtained at 120s of accumulation time was 3.9 x 10(-11) mol L-1. The proposed method was validated for the determination of nickel in water certified reference materials with good results.