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An Evaluation of solubility limits on maximum uranium concentrations in groundwater

地下水中の最大ウラン溶解度の評価

岩月 輝希; Arthur, R. C.*

Iwatsuki, Teruki; Arthur, R. C.*

岐阜県東濃地域において、地下水中におけるウラン溶解度を観察,熱力学解析等に基づいて推測した。その結果、地下水中のウランの溶解度を支配する固相としてアモルファスUO$$_{2}$$が挙げられた。また、その溶解度は地下水のpH, Eh, 炭酸ガス分圧により大きく異なることが確認された。

Maximum uranium concentrations in groundwaters associated with a uranium ore deposit in Japan appear to be controlled by the solubility of the amorphous hydrous oxide, UO$$_{2}$$(am). This conclusion is supported by calculated saturation indices for this mineral using geochemical data characterizing the deposit and its surroundings. The conclusion that UO$$_{2}$$(am) appears to be solubility controlling in a natural system that has evolved over long periods of time supports the assumption adopted in many international studies that the solubility of this phase would limit the aqueous concentrations of U released from a deep geologic repository for nuclear wastes over similar time scales. Natural systems can thus provide a useful framework for testing assumptions and models used in repository safety assessments.

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