Abstract
Chemical sensors selective to Pb2+ and Sn2+ ions were developed on the base of chalcogenide glasses (ChG) from the GeSe2-PbSe-PbTe and GeSe2-Sb2Se3-SnSe systems. All-solid-state sensors of the ‘coated wire’ type were designed consisting of inner Ag/AgCl reference electrode uniformly coated with composite mixture of binding polymer and Pb- and Sn- ChG powder. Pb(II)- and Sn(II)-sensors were tested in aqua solutions with respect to their basic analytical characteristics: stability, linearity and slope of the calibration function, working pH-range, limits of detection, response time and selectivity. The proposed sensors guarantee reliable analytical performance for water and waste water control with detection limits of the order of 10−6 mol/L, selectivity and chemical stability in aggressive media.
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