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Using X-ray Microscopy and Hg L-3 XAMES To Study Hg Binding in the Rhizosphere of Spartina Cordgrass
Patty, C; Barnett, B; Mooney, B; Kahn, A; Levy, S; Liu, YJ; Pianetta, P; Andrews, JC; Liu YJ(刘宜晋)
2009
发表期刊ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷号43期号:19页码:7397-7402
通讯作者[Patty, Cynthia ; Pianetta, Piero ; Andrews, Joy C.] SSRL, Menlo Pk, CA 94025 USA ; [Barnett, Brandy ; Mooney, Bridget ; Levy, Silvio ; Andrews, Joy C.] Calif State Univ E Bay, Dept Chem & Biochem, Hayward, CA 94542 USA ; [Kahn, Amanda] Moss Landing Marine Labs, Moss Landing, CA 95039 USA ; [Liu, Yijin] Inst High Energy Phys, Beijing 100039, Peoples R China
摘要San Francisco Bay has been contaminated historically by mercury from mine tailings as well as contemporary industrial sources, Native Spartina foliosa and non-native S. alterniflora-hybrid cordgrasses are dominant florae within the SF Bay estuary environment. Understanding mercury uptake and transformations in these plants will help to characterize the significance of their roles in mercury biogeochemical cycling in the estuarine environment. Methylated mercury can be biomagnified up the food web, resulting in levels in sport fish up to 1 million times greater than in surrounding waters and resulting in advisories to limit fish intake, Understanding the uptake and methylation of mercury in the plant rhizosphere can yield insight into ways to manage mercury contamination. The transmission X-ray microscope on beamline 6-2 at the Stanford Synchrotron Radiation Lightsource (SSRL) was used to obtain absorption contrast images and 3D tomography of Spartina foliosa roots that were exposed to 1 ppm Hg (as HgCl2) hydroponically for 1 week. Absorption contrast images of micrometer-sized roots from S. foliosa revealed dark particles, and dark channels within the root, due to Hg absorption. 3D tomography showed that the particles are on the root surface, and slices from the tomographic reconstruction revealed that the particles are hollow, consistent with microorganisms with a thin layer of Hg on the surface. Hg L-3 XANES of ground-up plant roots and Hg L-3 micro-XANES from microprobe analysis of micrometersized roots (60-120 mu m in size) revealed three main types of speciation in both Spartina species: Hg-S ligation in a form similar to Hg(II) cysteine, Hg-S bonding as in cinnabar and metacinnabar, and methylmercury-carboxyl bonding in a form similar to methylmercury acetate. These results are interpreted within the context of obtaining a "snapshot" of mercury methylation in progress.
文章类型Article
学科领域Engineering; Environmental Sciences & Ecology
研究领域[WOS]Engineering ; Environmental Sciences & Ecology
DOI10.1021/es901076q
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语种英语
WOS类目Engineering, Environmental ; Environmental Sciences
WOS记录号WOS:000270136500040
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被引频次:36[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240116
专题多学科研究中心
作者单位中国科学院高能物理研究所
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Patty, C,Barnett, B,Mooney, B,et al. Using X-ray Microscopy and Hg L-3 XAMES To Study Hg Binding in the Rhizosphere of Spartina Cordgrass[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2009,43(19):7397-7402.
APA Patty, C.,Barnett, B.,Mooney, B.,Kahn, A.,Levy, S.,...&刘宜晋.(2009).Using X-ray Microscopy and Hg L-3 XAMES To Study Hg Binding in the Rhizosphere of Spartina Cordgrass.ENVIRONMENTAL SCIENCE & TECHNOLOGY,43(19),7397-7402.
MLA Patty, C,et al."Using X-ray Microscopy and Hg L-3 XAMES To Study Hg Binding in the Rhizosphere of Spartina Cordgrass".ENVIRONMENTAL SCIENCE & TECHNOLOGY 43.19(2009):7397-7402.
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