| DOI: | 10.2172/1211575
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| 报告号: | DOE-UIC--0001730-1
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| 报告题名: | Final Technical Report: Mercury Release from Organic Matter (OM) and OM-Coated Mineral Surfaces |
| 作者: | Nagy, Kathryn L.
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| 出版年: | 2015
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| 发表日期: | 2015-08-18
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| 总页数: | 5
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| 国家: | 美国
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| 语种: | 英语
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| 英文关键词: | Mercury, natural organic matter, kaolinite, vermiculite, cinnabar, metacinnabar, soil
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| 中文主题词: | 土壤
; 有机物
; 硫磺
; 吸收
; 吸附作用
; 矿物
; X射线
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| 主题词: | SOILS
; ORGANIC MATTER
; SULFUR
; ABSORPTION
; MINERALS
; X-RAY
|
| 英文摘要: | Chemical reactions between mercury, a neurotoxin, and sulfur, an essential nutrient, in the environment control to a large extent the distribution and amount of mercury available for uptake by living organisms. The largest reservoir of sulfur in soils is in living, decaying, and dissolved natural organic matter. The decaying and dissolved organic matter can also coat the surfaces of minerals in the soil. Mercury (as a divalent cation) can bind to the sulfur species in the organic matter as well as to the bare mineral surfaces, but the extent of binding and release of this mercury is not well understood. The goals of the research were to investigate fundamental relationships among mercury, natural organic matter, and selected minerals to better understand specifically the fate and transport of mercury in contaminated soils downstream from the Y-12 plant along East Fork Poplar Creek, Tennessee, and more generally in any contaminated soil. The research focused on (1) experiments to quantify the uptake and release of mercury from two clay minerals in the soil, kaolinite and vermiculite, in the presence and absence of dissolved organic matter; (2) release of mercury from cinnabar under oxic and anoxic conditions; (3) characterization of the forms of mercury in the soil using synchrotron X-ray absorption spectroscopic techniques; and, (4) determination of molecular forms of mercury in the presence of natural organic matter. We also leveraged funding from the National Science Foundation to (5) evaluate published approaches for determining sulfur speciation in natural organic matter by fitting X-ray Absorption Near Edge Structure (XANES) spectra obtained at the sulfur K-edge and apply optimized fitting schemes to new measurements of sulfur speciation in a suite of dissolved organic matter samples from the International Humic Substances Society. Lastly, in collaboration with researchers at the University of Colorado and the U.S. Geological Survey in Boulder, Colorado, (6) we investigated the biogeochemical controls on the release of mercury in simulated flooding experiments using loose soils and intact soil cores from East Fork Poplar Creek. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1211575
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| Citation statistics: |
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/41795
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| File Name/ File Size |
Content Type |
Version |
Access |
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| 1211575.pdf（160KB） | 研究报告 | -- | 开放获取 | | View
Download
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| Recommended Citation: | |
Nagy, Kathryn L.. Final Technical Report: Mercury Release from Organic Matter (OM) and OM-Coated Mineral Surfaces. 2015-01-01.
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