| DOI: | 10.2172/1047186
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| 报告号: | DOE/SC0005351-1
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| 报告题名: | Final Project Report: "Exploratory Research: Mercury Stable Isotopes as Indicators of the Biogeochemical Cycling of Mercury" |
| 作者: | Johnson, Thomas M
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| 出版年: | 2012
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| 发表日期: | 2012-08-01
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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
; water
; contamination
; Y-12 plant
; stable isotopes
; biogeochmistry
|
| 中文主题词: | 土壤
; 同位素
; 沉积物
; 稳定同位素
|
| 主题词: | SOILS
; ISOTOPES
; SEDIMENTS
; STABLE ISOTOPES
|
| 英文摘要: | This is the final project report for award DE-SC0005351, which supported the research project "Exploratory Research: Mercury Stable Isotopes as Indicators of the Biogeochemical Cycling of Mercury. "This exploratory project investigated the use of mercury (Hg) stable isotope measurements as a new approach to study how Hg moves and changes its chemical form in environmental systems, with particular focus on the East Fork of Poplar Creek (EFPC) near the DOE Y-12 plant (a Hg contamination source). This study developed analytical methods and collected pilot data that have set the stage for more detailed studies and have begun to provide insights into Hg movement and chemical changes. The overall Hg stable isotope approach was effective. The Hg isotope analysis methods yielded high-precision measurements of the sediment, water, and fish samples analyzed; quality control measures demonstrated the precision. The pilot data show that the 202Hg/198Hg, 199Hg/198Hg, and 201Hg/198Hg isotope ratios vary in this system. 202Hg/198Hg ratios of the Hg released from the Y-12 plant are relatively high, and those of the regional Hg background in soils and river sediments are significantly lower. Unfortunately, 202Hg/198Hg differences that might have been useful to distinguish early Hg releases from later releases were not observed. However, 202Hg/198Hg ratios in sediments do provide insights into chemical transformations that may occur as Hg moves through the system. Furthermore, 199Hg/198Hg and 201Hg/198Hg ratio analyses of fish tissues indicate that the effects of sunlight-driven chemical reactions on the Hg that eventually ends up in EFPC fish are measureable, but small. These results provide a starting point for a more detailed study (already begun at Univ. of Michigan) that will continue Hg isotope ratio work aimed at improving understanding of how Hg moves, changes chemically, and does or does not take on more highly toxic forms in the Oak Ridge area. This work also benefits efforts to trace Hg contamination in the Clinch and Tennessee Rivers, into which EFPC flows, and to distinguish Hg from the Y-12 plant from that released from a nearby coal ash accident. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1047186
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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/40583
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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 |
License |
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| 1047186.pdf（139KB） | 研究报告 | -- | 开放获取 | | View
Download
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| Recommended Citation: | |
Johnson, Thomas M. Final Project Report: "Exploratory Research: Mercury Stable Isotopes as Indicators of the Biogeochemical Cycling of Mercury". 2012-01-01.
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