CHALCOGENIDE GLASS ELECTRODES SENSITIVE TO HEAVY-METAL IONS

The selective response to Hg**2** plus , Cd**2** plus and Cu**2** plus ions was studied for HgS- and CdS- Ge//0//. //2//0Te//0//. //3//0Se//0//. //5//0 and Cu//2Se-As//0//. //4//0Se//0//. //6//0 glass electrodes. These glass electrodes, containing a suitable amount of the above heavy metals, showed the Nernstian response to the corresponding metal ions. Some metal ions, however, interfered with the selective response. The selectivity of these glass electrodes was found to be connected with the relative position of the Fermi levels of the chalcogenide glasses and redox couples for metal ions.