Chalcogenide ion selective electrodes

Details Chalcogenide ion selective electrodes Chalcogenide ion selective electrodes

1993-11-24

1994-11-22

Niebling, John

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

204420, C03C 332, C03C 418, G01N 2726

Patent

active

053669363

ABSTRACT:
A novel series of chalcogenide glass compositions that are relatively highly selective for a specific ion in solution. When utilized as a sensing element for electrodes or similar analytical devices, a modified surface layer is formed on the surface of the glass in contact with the test solution. The surface layer being characterized by a surface ionic conductivity ranging from 10.sup.-7 to 10.sup.-2 S/cm, a diffusion coefficient ranging from 10.sup.-11 to 10.sup.-6 cm.sup.2 /s and having a ratio of electronic to ionic conductivity within the modified surface layer of not more than 1.0. Specific compositions having these unique morphology and transport properties are disclosed for the detection of cadmium, silver, thallium, mercury, copper and lead.

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Lead Ion-Selective Electrodes, Yu. G. Vlasov and E. A. Bychkov, Chalcogenide Glass Electrodes, pp. 6-93.

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