Studies on the Chemical Durabilities of Glasses by Means of a Flame Photometer, (II)

Abstract

In succession to our previous report [this Journal; 63 [704] 6 (1955)], amounts of alkaline metal ions and alkaline earth metal ions leached out of the glass by boiling water are determined separately by means of a flame photometer and their total is compared with values obtained by acid titration. All glass samples are of the ordinary soda-lime-silica glass type. Comparison of the values obtained by these two methods are in good agreement in this experiment with glass samples containing only silica as acidic component.
Alkaline earth metal ions are leached out in fairly noticeable amount by glasses of three components type, but the introduction of alumina as the fourth component suppresses markedly the migration of alkaline earth metal ions into water, while this suppressing effect on the alkaline metal ions is less remarkable.
With the flame photometer of our laboratory, the mutual interference of ions of the alkaline metals and alkaline earth metals are studied with the result that in the concentration range usually met in these durability experiments and quantitative analysis of glass the interference can be neglected.