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Electrodes/Biosensors

Sodium Ion-Selective Chalcogenide Glass Electrodes

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Pages 1125-1144 | Received 18 Jan 1989, Accepted 20 Jan 1989, Published online: 23 Oct 2006
 

Abstract

Analytical characteristics and sensing mechanism of sodium ion-selective electrodes based on NaCl-Ga2S3-GeS2 glasses have been investigated. Chalcogenide glass electrodes containing 10 mol.% NaCl in the membrane showed near-Nernstian response in the concentration range from 10-3 to 1 M sodium nitrate solution. These sensors were superior to the conventional pNa oxide glass electrodes in selectivity in the presence of hydrogen ions and in Na+ ion sensitivity in fluoride media. Prolonged solution treatment for several days reduces, however, the detection limit of the sensors and the slope of the electrode response. Ionic processes at the membrane surface have been investigated using XPS technique and 22Na tracer measurements. It was shown that sodium ion-exchange governed Na+ ion response of chalcogenide

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