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DOI | 10.1073/pnas.1611918114 |
Uranium(IV) adsorption by natural organic matter in anoxic sediments | |
Bone, Sharon E.1; Dynes, James J.2; Cliff, John3; Bargar, John R.1 | |
2017-01-24 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2017 |
卷号 | 114期号:4页码:711-716 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Canada |
英文摘要 | Uranium is an important carbon-free fuel source and environmental contaminant that accumulates in the tetravalent state, U(IV), in anoxic sediments, such as ore deposits, marine basins, and contaminated aquifers. However, little is known about the speciation of U(IV) in low-temperature geochemical environments, inhibiting the development of a conceptual model of U behavior. Until recently, U(IV) was assumed to exist predominantly as the sparingly soluble mineral uraninite (UO2+x) in anoxic sediments; however, studies now show that this is not often the case. Yet a model of U(IV) speciation in the absence of mineral formation under field-relevant conditions has not yet been developed. Uranium(IV) speciation controls its reactivity, particularly its susceptibility to oxidative mobilization, impacting its distribution and toxicity. Here we show adsorption to organic carbon and organic carbon-coated clays dominate U(IV) speciation in an organic-rich natural substrate under field-relevant conditions. Whereas previous research assumed that U(IV) speciation is dictated by the mode of reduction (i.e., whether reduction is mediated by microbes or by inorganic reductants), our results demonstrate that mineral formation can be diminished in favor of adsorption, regardless of reduction pathway. Projections of U transport and bioavailability, and thus its threat to human and ecosystem health, must consider U(IV) adsorption to organic matter within the sediment environment. |
英文关键词 | uranium organic matter STXM NanoSIMS EXAFS |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000392597000045 |
WOS关键词 | X-RAY SPECTROMICROSCOPY ; U(VI) REDUCTION ; ABSORPTION SPECTROSCOPY ; NEXAFS SPECTROSCOPY ; MONOMERIC U(IV) ; PRODUCTS ; AQUIFER ; SOIL ; BIOREMEDIATION ; SPECIATION |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/204795 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 94025 USA; 2.Canadian Light Source, Saskatoon, SK S7N 2V3, Canada; 3.Pacific Northwest Natl Lab, Environm Mol Sci Lab, Richland, WA 99354 USA |
推荐引用方式 GB/T 7714 | Bone, Sharon E.,Dynes, James J.,Cliff, John,et al. Uranium(IV) adsorption by natural organic matter in anoxic sediments[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2017,114(4):711-716. |
APA | Bone, Sharon E.,Dynes, James J.,Cliff, John,&Bargar, John R..(2017).Uranium(IV) adsorption by natural organic matter in anoxic sediments.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,114(4),711-716. |
MLA | Bone, Sharon E.,et al."Uranium(IV) adsorption by natural organic matter in anoxic sediments".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 114.4(2017):711-716. |
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