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Initial dissolution rate of a Japanese simulated high-level waste glass P0798 as a function of pH and temperature measured by using micro-channel flow-through test method

Inagaki, Yaohiro*; Makigaki, Hikaru; Idemitsu, Kazuya*; Arima, Tatsumi*; Mitsui, Seiichiro; Noshita, Kenji*

Dissolution tests were performed for a simulated HLW glass by using a Micro-Channel Flow-Through (MCFT) test to evaluate the initial dissolution rate, $$r$$$$_{0}$$, as a function of pH and temperature. The results indicated that the $$r$$$$_{0}$$ shows a "V-shaped" pH dependence at 25$$^{circ}$$C, which is almost consistent with the previous results measured by using other test methods including Single Pass Flow-Through (SPFT) test. At elevated temperatures, however, the $$r$$$$_{0}$$ shows a "U-shaped" pH dependence with a flat bottom at neutral pH, which differs from the previous results. The results also indicated that the MCFT provided a higher value of the $$r$$$$_{0}$$with a steep slope of pH dependence than the SPFT results at basic pH from 8 to 11 at 90$$^{circ}$$C. With respect to the temperature dependence, the $$r$$$$_{0}$$ increases with temperature according to an Arrhenius law at any pH, and the apparent activation energy increases with pH, which suggests that the dissolution mechanism can change depending on pH.

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Category:Nuclear Science & Technology

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