Study on solubility of transuranium elements, II

Moriyama, Hirotake*

In support of the safety assessment of geologic disposal of high levcl radioactive wastes, the solubility of transuranium elements was studied. The solubility of PuO $_{2}$ xH $_{2}$ O was measured undcr a reducing condition, and the solubility product K $^{0}_{sp}$ and the stability constant $_{4}$ of Pu(OH) $_{4}$ were obtained. The obtained K $^{0}_{sp}$ value was found to be much smaller than that predicted by Rai et al. from its dependence on ionic radius. Also, the solubility of PuO $_{3}$ 3 xH $_{2}$ O was measured under an oxidizing condition and the solubility product K $^{0}_{sp}$ was obtained. In the analysis of hydrolysis constants of actinide ions, it was found that the systematic trend of the hydrolysis constants was well explained by the hard sphere model considering the effective charges of actinide ions.

Language	:	Japanese
Report No.	:	JNC TJ8400 2000-050
Pages	:	47 Pages
Publication Year/Month	:	2000/03
Patent information	:
PDF	:	JNC-TJ8400-2000-050.pdf:1.49MB
Paper URL	:
Keywords	:	アクチニドイオン; イオン半径; ウラン; プルトニウム; 安定性; 安定度数; 加水分解定数; 核種; 隔離法; 環境汚染; 還元性; 剛体球; 剛体球モデル; 酸化性; 使用済燃料要素; 地層処分; 地層処理; 超ウラン元素; 長寿命放射性元素; 廃棄物; 廃棄物処分; 放射性廃棄物; 有効電荷; 溶解度; 溶解度積
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Article of JAEA R&D Review	:
Cooperating Institute	:	京都大学
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Registration No. : GJ0819990014
JAEA Abstracts No. :

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