The Use of Partial-Replenishment Tests in Modeling the Leach behavior of Glasses

Abstract

The partial-replenishment test can be an important tool in exploring the long-term leach behavior of glasses. In order to demonstrate the use of partial-replenishment test data in modeling, experiments were conducted which show that after a relatively short period test results become largely independent of exchange interval and volume exchange fraction. The results can be characterized by the ratio between these two parameters, which corresponds to the residence time. Sampling of the leachates during a given exchange interval shows that leachate concentrations quickly recover following the exchange, and that this recovery can be satisfactorily described using a simple model based on first-order approach to equilibrium at the silica saturation level.

Corrosion of Glass

“…Included are various standard test methods [1][2][3][4][5][6] allowing comparison of specific dissolution properties of different glass compositions, test methods for quantification of rate law parameters [7,8], tests for simulating service conditions, and so on. In these tests, powdered or bulk glass samples with or without special surface treatments are exposed to stagnant or flowing aqueous media, distilled water [9], or other corrosive fluids at low or high temperatures in autoclaves [10].…”