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Correlation between hydrolytic ion release and pH changes in type II glass containers

The correlation between hydrolytic ion release and pH changes was studied in 100 ml type II glass containers, filled with water or NaCI at various concentrations and autoclaved for I h at 121°C. The sodium ion exchange reaction at the glass-aqueous solution interface is shifted to the left (decrease of sodium release) up to approx. 2% (w/v) NaCI concentrations, while with higher NaCI percentages the hydrolytic release is similar to that obtained with water. Since the hydrolytic release is strongly related to the pH of the attacking solution and to the thickness of sodium-impoverished layer of the treated glass surface, the trend of hydrolytic release in function of these two parameters is shown. By the trend of hydrolytic release in a container autoclaved first with NaCI 0.9% at pH > 7 (provided that no drastic attack of the glass surface has occurred at high pH) and then autoclaved with water, a very important practical implication is obtained: any bottle filled with a solution of NaCI 0.9 %, if after autoclaving is found with a pH > 7, it can be assessed after further autoclavings with water, whether the pH raising was caused by insufficient glass treatment or by a high pH of the filling solution.