Comparison of simulated waste glass by the manufacturing condition in the vitrification process, 2; Evaluation by synchrotron radiation based XAFS measurements

Okamoto, Yoshihiro  ; Nagai, Takayuki  ; Kobayashi, Hidekazu ; Shiwaku, Hideaki   ; Seki, Katsumi*; Kobayashi, Hiromi*; Homma, Masanobu*; Hatakeyama, Kiyoshi*

Research work on vitrification technique with higher loading capacity of high-level liquid waste in the glass is important in order to reduce total amount of waste generated. In the present work, synchrotron radiation based XAFS analysis was performed for the glass samples obtained from bottom drain tests with several conditions such as different loading capacities and gas bubbling. As the results of XAFS analysis, it can be seen that distribution of platinum group metal (PGM) in the glass is scattered and oxidation state of some elements such as chromium changed into reduction state. On the other hand, oxidation state of some elements like iron and zinc did not changed by the bubbling. These results suggest behavior of each element in the borosilicate glass can be evaluated from information on its spacial distribution and local coordination.