Anodic stripping voltammetry following double deposition and stripping steps: Application of a new approach in the course of lead ion determination

A new approach of double deposition and stripping steps was proposed in the course of anodic stripping lead ion determination in order to decrease the detection limit. Two bismuth film working electrodes differing in their surface area and mounted in one body were used for the measurements. In short, an ensemble of microelectrodes was centrally mounted in the electrode of a large surface area. The application of a new type of arrangement in combination with the additional deposition and stripping steps in one measurement cycle and in one electrochemical cell not only increased the sensitivity of determinations, but also facilitated the analysis. The obtained detection limit for the determination of lead ions following deposition time of 300 s at both working electrodes was 2.4x10(-11) mol L-1. The proposed procedure was successfully applied for analysis of certified reference material that confirms the accuracy of the proposed methodology.