YU Tien- ying
Abstract: By using potassium- selective electrode with silver as reference elec-trode, the quantity of potassium oxide in raw n1aterial for ceramic indu-stry has been determined. Kalignost as the titrant combines with K+ to produce precipitate K [B ( C8H5 ) 4]. The reecticn is quantitative at PH= 10. The ions Fe+8， Mg+2, Al=3 are scparatcd fron liquid phase in precipitate form to result in decrease in ionie strength which is favourable to titration. Accurate result can be obtained, when the K+ concentration is ranged from 10-8 to 10-2M. The titrant is unstable for store, and re-gular standardizing should be done.
Keywords: potassium- selective electrode;titrant combines