文章基本信息

标题：Phosphate amendments for chemical immobilization of uranium in contaminated soil
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作者：Matthew R. Baker ; Fanny M. Coutelot ; John C. Seaman 等
期刊名称：Environment International
印刷版ISSN：0160-4120
电子版ISSN：1873-6750
出版年度：2019
卷号：129
页码：1-8
DOI：10.1016/j.envint.2019.03.017
出版社：Pergamon
摘要：Uranium (U) contamination is a major environmental problem associated with the mining and processing of nuclear materials for both weapons and power production. When possible, in situ soil remediation techniques are preferable for reducing the risk associated with diffuse low-level U contamination. Uranium is known to form sparingly soluble phosphate compounds that persist in the environment. Therefore, batch experiments were performed to evaluate the efficacy of three phosphate amendments, hydroxyapatite (HA), sodium phytate (IP6) and sodium tripolyphosphate (TPP), to immobilize U in contaminated sediments. The amendments were added at equivalent phosphorus (P) concentrations and then equilibrated under a range of test conditions, with changes in soluble U and P total monitored at pre-set time intervals. Only HA was effective at reducing the soluble U soil fraction when compared to the control, with IP6 and TPP increasing the soluble U soil fraction. After equilibration, changes in contaminant partitioning in the amended sediments were evaluated using operational extraction methods. Sequential extraction results for HA generally indicated a transfer of U from labile to more recalcitrant phases, while the results for IP6 and TPP were more ambiguous.
关键词：Soil contamination ; Uranium ; Uranyl ; Phytate ; Hydroxyapatite ; Phosphate ; Autunite ; Batch experiment ; Immobilization ; Sequential extraction