HIGH NA-AL2O3-B2O3-SIO2 GLASS ELECTRODES SPOILED BY NETWORK HYDROLYSIS AND DISSOLUTION( SELECTIVITY OF LI2O)

Authors
BELYUSTIN AA BAGANDOVA ED
Citation
Aa. Belyustin et Ed. Bagandova, HIGH NA-AL2O3-B2O3-SIO2 GLASS ELECTRODES SPOILED BY NETWORK HYDROLYSIS AND DISSOLUTION( SELECTIVITY OF LI2O), Sensors and actuators. B, Chemical, 19(1-3), 1994, pp. 387-388
Citations number
5
Categorie Soggetti
Engineering, Eletrical & Electronic","Instument & Instrumentation
Journal title
Sensors and actuators. B, Chemical → ACNP
ISSN journal
09254005
Volume
19
Issue
1-3
Year of publication
1994
Pages
387 - 388
Database
ISI
SICI code
0925-4005(1994)19:1-3<387:HNGESB>2.0.ZU;2-#
Abstract
Potential-pH relationships and selectivity coefficients K(ij)sel for g lass electrodes (GEs) of xLi2O-xAl2O3-0.25xB2O3-(100-2.25x)SiO2 glasse s, where x=20, 16, 12 and 10 mol%, have been investigated. The origina l Na+ to Li+ and Na+ to H+ selectivity of the GEs increases with a dec rease of x. This is accounted for by the increase of the degree of scr eening of the AlO4/2- sites with SiO4/2 tetrahedra 'shell', where Nais more mobile than Li+ or H+. Treatment of the GEs with acid solution (pH = 0) causes the hydrolysis and selective dissolution of SiO2. The degree of screening and Na+ selectivity decrease.