Abstract
New membrane materials were studied for thallium (I)-selective chemical sensors based on chalcogenide glasses in the TlI-Ag2S-As2S3 system. Using these studies on the radioactive tracers diffusion (108mAg и 204Tl) and electrical conductivity, an ionic conductivity of σion=10−7Ohm−1cm−1 (20°C) was found for the glass composition 27%TlI-20%Ag2S-53%As2S3. This composition of chalcogenide glass was selected as a membrane material for the Tl-selective chemical sensor displaying a value of the electrode function of 57mV/pTl and a detection limit of 3×10−6moll−1.
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