Identification of Uranium Species Released from the Waste Glass in Contact with Bentonite

Yellowish uranium compounds were enriched at the interface between a Ca-bentonite block and a waste glass, containing about $20\%$ uranium oxide, in contact with the block due to the dissolution of uranium by a synthetic granitic groundwater in Ar atmosphere. The uranium compound formed for 6 years leach time was identified as a beta-uranophane $[Ca(UO_2)_2(SiO_{3}OH)_{2}5H_{2}O]$ using XRD, IR and mass spectrometer. The solubility of the beta-uranophane was measured to be about $10^{-6}\;mole/L$ in de-mineralized water at $80^{\circ}C$.

칼슘-벤토나이트와 접한 약 $20\%$의 우라늄 산화물을 함유한 유리고화체가 알곤 분위기에서 모의 화강암지하수에 의해 침출되었을 때 노란색의 우라늄화합물이 벤토나이트와 고화체의 경계면에 농축되었다. 6년간의 침출후 형성된 우라늄 화합물이 beta-uranophane $[Ca(UO_2)_2(SiO_{3}OH)_{2}5H_{2}O]$임을 XRD, 적외선 스펙트럼과 질량분석기를 이용하여 확인하였으며, 이 화합물의 용해도를 $80^{\circ}C$, 탈이온수에서 측정한 결과 약 $10^{-6}\;mole/L$ 이었다.