Measured solubilities and speciations of neptunium, plutonium, and americium in a typical groundwater (J-13) from the Yucca Mountain region; Milestone report 3010-WBS 1.2.3.4.1.3.1
Measured solubilities and speciations of neptunium, plutonium, and americium in a typical groundwater (J-13) from the Yucca Mountain region; Milestone report 3010-WBS 1.2.3.4.1.3.1
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DOI：
10.2172/140068
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发表时间：
1993-07
期刊：
影响因子：
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通讯作者：
H. Nitsche;R. C. Gatti;E. M. Standifer
中科院分区：
文献类型：
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作者：
H. Nitsche;R. C. Gatti;E. M. Standifer
溶解度和形态数据对于了解水体放射性核素在地质圈中的传输非常重要。它们定义了传输延迟过程（例如吸附和胶体形成）的源术语。溶解度和形态数据可用于验证作为预测输运模型一部分的地球化学代码的有效性。结果来自 {sup 237}NpO{sub 2}{sup +}、{sup 239}Pu{sup 4+}、{sup 241}Am{sup 3+}/Nd{sup 3+} 和 {sup 243}Am{sup 3+} 在 J-13 地下水（来自丝兰）中的溶解度和形态实验 内华达州山区，正在将其作为潜在的高放核废料处置场进行研究），在三种不同的温度（25{度}、60{度}和 90{度}C）和 pH 值（5.9、7.0 和 8.5）下进行。确定了控制溶解度的稳态固体，并确定了上清液中存在的形态和/或氧化态。镎溶解度随着温度和 pH 值的升高而降低。钚浓度随温度升高而降低，且随 pH 值变化无趋势。随着温度升高和 pH 值升高，镅溶液没有表现出明显的溶解度趋势。
Solubility and speciation data are important in understanding aqueous radionuclide transport through the geosphere. They define the source term for transport retardation processes such as sorption and colloid formation. Solubility and speciation data are useful in verifying the validity of geochemical codes that are part of predictive transport models. Results are presented from solubility and speciation experiments of {sup 237}NpO{sub 2}{sup +}, {sup 239}Pu{sup 4+}, {sup 241}Am{sup 3+}/Nd{sup 3+}, and {sup 243}Am{sup 3+} in J-13 groundwater (from the Yucca Mountain region, Nevada, which is being investigated as a potential high-level nuclear waste disposal site) at three different temperatures (25{degree}, 60{degree}, and 90{degree}C) and pH values (5.9, 7.0, and 8.5). The solubility-controlling steady-state solids were identified and the speciation and/or oxidation states present in the supernatant solutions were determined. The neptunium solubility decreased with increasing temperature and pH. Plutonium concentrations decreased with increasing temperature and showed no trend with pH. The americium solutions showed no clear solubility trend with increasing temperature and increasing pH.