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首页> 外文期刊>Talanta: The International Journal of Pure and Applied Analytical Chemistry >Kinetic study of uranium speciation in model solutions and in natural waters using Competitive Ligand Exchange Method
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Kinetic study of uranium speciation in model solutions and in natural waters using Competitive Ligand Exchange Method

机译：用竞争性配体交换法研究模型溶液和天然水中铀形态的动力学

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摘要

Kinetic speciation of uranium in model solutions containing uranium and humic acid (HA) and in natural waters has been investigated by Competitive Ligand Exchange Method (CLEM). In alkaline freshwaters, most of uranium species were uranium-carbonate species, which were labile in the CLEM experiment. The uranium speciation of every sample was characterized either as "labile" or "non-labile" uranium complexes depending on the dissociation rate coefficients of the complexes. The results showed that as the U(VI)/HA ratio was decreased, the dissociation rate coefficients decreased and the labile fraction decreased as well. When the U(V])/HA ratio was 0.1, the labile fraction of the U(VI)-HA increased with increasing pH; however, there was no pH effect on the dissociation of U(VI)-HA complexes at lower U(VI)/HA ratios. Chelex-100 had some limitations in its use for the study of dissociation of U(VI)-HA complex at very low U(V])/HA ratios. By developing an analytical method and procedure for quantitative determination of kinetic parameters for the dissociation of uranium-HA complexes in model solutions and natural waters, this work has made a substantial Contribution to analytical chemistry. (C) 2008 Elsevier B.V. All rights reserved.
机译：已通过竞争性配体交换法（CLEM）研究了含铀和腐殖酸（HA）的模型溶液以及天然水中铀的动力学形态。在碱性淡水中，大多数铀物种是碳酸铀铀，在CLEM实验中不稳定。每个样品的铀形态被表征为“不稳定的”或“不稳定的”铀配合物，具体取决于配合物的解离速率系数。结果表明，随着U（VI）/ HA比例的降低，解离速率系数降低，不稳定分数也降低。当U（V]）/ HA的比率为0.1时，U（VI）-HA的不稳定部分随pH值的增加而增加;但是，在较低的U（VI）/ HA比下，pH对U（VI）-HA复合物的解离没有影响。 Chelex-100在研究U（VI）/ HA比例非常低的U（VI）-HA复合物的解离方面有一定的局限性。通过开发用于定量确定模型溶液和天然水中铀-HA络合物解离动力学参数的分析方法和程序，这项工作对分析化学做出了重大贡献。 （C）2008 Elsevier B.V.保留所有权利。

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