稀土/稀有金属null检测 | 铀的形态：热力学数据库的编制及其采不同分析技术的实验评价-北京欧兰科技发展有限公司

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应用领域	地矿
检测样本	稀土/稀有金属
检测项目
参考标准	暂无

采用立陶宛Ekspla公司的纳秒激光器构成激光诱导荧光测试系统。对铀样品进行光谱测量，获得了铀热力学数据，并对不同分析技术的实验结果进行了比较和分析。

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NL300系列高能量电光调Q激光器
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Environmental hazards are caused by uranium mining legacies and enhanced radioactivity in utilized groundwater and surface water resources. Knowledge of uranium speciation in these waters is essential for predicting radionuclide migration and for installing effective water purification technology. The validity of the thermodynamic data for the environmental media affected by uranium mining legacies is of utmost importance. Therefore, a comprehensive
and consistent database was established according to current knowledge. The uranium data included in the database is based on the NEA TDB (Guillaumont et al. 2003) and is modified or supplemented as necessary e.g. for calcium and magnesium uranyl carbonates. The specific ion interaction theory (Brönsted, 1922) is used to estimate activity constants, which is sufficient for the considered low ionic strengths. The success of this approach was evaluated by comparative experimental investigations and model calculations (PHREEQC (Parkhurst and Appelo, 1999)) for several model systems. The waters differ in pH (2.7–9.8), uranium concentration (10−9-10−4 mol/L) and ionic strength (0.002–0.2 mol/L). We used chemical extraction experiments, ESI-Orbitrap-MS and time-resolved laser-induced fluorescence
spectroscopy (TRLFS) to measure the uranium speciation. The latter method is nonintrusive and therefore does not change the chemical composition of the investigated waters. This is very important, because any change of the system under study may also change the speciation.

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