Lead Selective Electrode Based On Chalcogenide Bulk Glass For Multi-Sensor Applications

The sensing properties of two chalcogenide materials were investigated. It is shown that membranes based on the PbI2-Ag2S-As2S3 and PbS-Ag2S-As2S3 materials show sensitivity to the presence of Pb2+ species in solution. In both cases they exhibit near-Nernstian response. We mainly focused on the best matrix. The basic physicochemical parameters were then measured. The developed ISE exhibits a near-Nernstian slope of 27 mV/decade versus Pb2+ in the range of 10(-5,5) - 10(-3) M. Moreover the proposed Pb-SE shows excellent out-put signal in the presence of foreign ions. The analytical properties such as reproducibility, response time, and stability were studied. We report a multi-sensor process that we developed for in-situ real-time monitoring of waste water. The very first results of prototype measurements are presented.