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Initial Dissolution Rate of the International Simple Glass as a Function of pH and Temperature Measured Using Microchannel Flow‐Through Test Method
Author(s) -
Inagaki Yaohiro,
Kikunaga Taiki,
Idemitsu Kazuya,
Arima Tatsumi
Publication year - 2013
Publication title -
international journal of applied glass science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 34
eISSN - 2041-1294
pISSN - 2041-1286
DOI - 10.1111/ijag.12043
Subject(s) - dissolution , borosilicate glass , arrhenius equation , activation energy , materials science , atmospheric temperature range , volumetric flow rate , analytical chemistry (journal) , thermodynamics , chemistry , metallurgy , chromatography , physics
International simple glass (ISG) is a six‐component alumino‐borosilicate glass developed as a reference benchmark glass for six nations collaborating study on high‐level nuclear waste glass dissolution/corrosion mechanism. In this study, aqueous dissolution tests were performed for the ISG using microchannel flow‐through (MCFT) method to evaluate the initial dissolution rate of glass matrix, r 0 , precisely and systematically as a function of solution pH and temperature. The test results indicated that the r 0 shows a “V‐shaped” pH dependence with a bottom at around pH 4 at each temperature. Compared with Japanese reference glass of P0798, for which the r 0 showed a “U‐shaped” pH dependence with a bottom at around pH6 in our previous study, the ISG shows the higher dissolution rate at basic pH, and lower dissolution rate at neutral to acidic pH . The results also indicated that the r 0 increases with temperature according to an Arrhenius law, and the apparent activation energy evaluated from Arrhenius relation is 62–77 [kJ/mol] at any pH from 3 to 10, which suggests the initial dissolution of ISG proceeds controlled by a surface‐reaction mechanism in this pH range.