Neptunium and Plutonium Solubilities in a Yucca Mountain Groundwater
Neptunium and Plutonium Solubilities in a Yucca Mountain Groundwater
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丝兰山地下水中镎和钚的溶解度
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
C. Drew Tait
中科院分区：
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作者：
D. Efurd;W. Runde;J. Banar;D. Janecky;J. Kaszuba;Phillip D. Palmer;F. Roensch;C. Drew Tait
在三种不同的温度（25、60和90 °C）和pH值（6.0、7.0和8.5）下，研究了镎和钚在来自内华达州尤卡山核废料处置库的J-13地下水（离子强度约为3.7 mmol;总溶解碳酸盐为2.8 mmol）中的溶解度。实验从过饱和和欠饱和在定义的CO2分压进行。过饱和态的237 Np溶解度范围为（9.40 ± 1.22）× 10-4 M（pH6.0和60 °C）和（5.50 ± 1.97）× 10-6 M（pH8.5和90 °C）。来自欠饱和（温度为25和90 °C，pH值为6、7和8.5）的溶解度实验的分析结果收敛于这些值。239/240 Pu的溶解度范围为（4.70 ± 1.13）× 10-8 M（pH6.0和25 °C）~（3.62 ± 1.14）× 10-9 M（pH8.5和90 °C）。在一般情况下，镎和钚的溶解度随pH值和温度的升高而降低。结果表明，Np_2O_5·xH_2O是一种绿色晶体。
Solubilities of neptunium and plutonium were studied in J-13 groundwater (ionic strength of about 3.7 mmol; total dissolved carbonate of 2.8 mmol) from the proposed Yucca Mountain Nuclear Waste Repository site, Nevada, at three different temperatures (25, 60, and 90 °C) and pH values (6.0, 7.0, and 8.5). Experiments were performed from both over- and undersaturation at defined CO2 partial pressures. The solubility of 237Np from oversaturation ranged from a high of (9.40 ± 1.22) × 10-4 M at pH 6.0 and 60 °C to a low of (5.50 ± 1.97) × 10-6 M at pH 8.5 and 90 °C. The analytical results of solubility experiments from undersaturation (temperatures of 25 and 90 °C and pH values 6, 7, and 8.5) converged on these values. The 239/240Pu solubilities ranged from (4.70 ± 1.13) × 10-8 M at pH 6.0 and 25 °C to (3.62 ± 1.14) × 10-9 M at pH 8.5 and 90 °C. In general, both neptunium and plutonium solubilities decreased with increasing pH and temperature. Greenish-brown crystalline Np2O5·xH2O was identified as the solubil...