Abstract
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.
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