Solubility product of hexavalent uranium hydrous oxide
Solubility product of hexavalent uranium hydrous oxide
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DOI：
10.3327/jnst.42.289
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发表时间：
2005-03-01
影响因子：
1.2
通讯作者：
Moriyama, H
中科院分区：
文献类型：
--
作者：
Fujiwara, K;Yamana, H;Moriyama, H
在25±1℃nacl溶液中，测定了氢离子浓度（pHc）在4 ~ 6范围内的U（VI）水合氧化物的溶解度。在离子强度I=0.1、0.5和1.0时采用过饱和法，在离子强度I=1.0时采用欠饱和法。发现固相由UO(3)(3)的混合物组成。用XRD测定了2H(2)O和UO2(OH)(2)。通过电感耦合等离子体质谱法（ICP-MS）测定U（VI）的浓度，并考虑到U（VI）的水解物质如（UO2）(2)(OH)(2)（2+）的参与，对U（VI）的溶解度产物（K-sp）进行分析。根据水解物质的文献值和特定相互作用理论（SIT），确定了标准状态（I=0）下的log K-sp°值为log K-sp°=-22.46±0.10。认识到不同固相导致的对数K-sp°值可能存在差异。
The solubility of U(VI) hydrous oxide was measured in the hydrogen ion concentration (pHc) range from 4 to 6 at 25 ± 1° C in a NaClO4 solution. The experiment was carried out by oversaturation method at ionic strength I=0.1, 0.5 and 1.0 and by undersaturation method at I=1.0. The solid phase was found to be composed of a mixture of UO(3)(.)2H(2)O and UO2(OH)(2) by XRD. The concentration of U(VI) was measured by inductively coupled plasma mass spectrometry (ICP-MS), and was analyzed to obtain the solubility products (K-sp), by taking into account the participation of the U(VI) hydrolysis species such as (UO2)(2)(OH)(2)(2+). By using the literature values of the hydrolysis species and by using the specific interaction theory (SIT), the log K-sp° value at the standard state (I=0) was determined to be log K-sp°=-22.46 ± 0.10. Possible differences in the log K-sp° values due to different solid phases were recognized.