Final Technical Report: Mercury Release from Organic Matter (OM) and OM-Coated Mineral Surfaces

doi:10.2172/1211575

GSTDTAP > 地球科学

DOI	10.2172/1211575
报告编号	DOE-UIC--0001730-1
来源ID	OSTI ID: 1211575
	Final Technical Report: Mercury Release from Organic Matter (OM) and OM-Coated Mineral Surfaces
	Nagy, Kathryn L.
	2015-08-18
出版年	2015
页数	5
语种	英语
国家	美国
领域	地球科学
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.
英文关键词	Mercury, natural organic matter, kaolinite, vermiculite, cinnabar, metacinnabar, soil
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来源平台	US Department of Energy (DOE)
引用统计
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/6918
专题	地球科学
推荐引用方式 GB/T 7714	Nagy, Kathryn L.. Final Technical Report: Mercury Release from Organic Matter (OM) and OM-Coated Mineral Surfaces,2015.