Actions for Identification of multiple mercury sources to stream sediments near Oak Ridge, TN, USA [electronic resource].

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Identification of multiple mercury sources to stream sediments near Oak Ridge, TN, USA [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Science, 2014.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
pages 3,666-3,674 : digital, PDF file
Additional Creators
United States. Department of Energy. Office of Science and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
In this paper, sediments were analyzed for total Hg concentration (THg) and isotopic composition from streams and rivers in the vicinity of the Y-12 National Security Complex (Y12) in Oak Ridge, TN (USA). In the stream directly draining Y12, where industrial releases of mercury (Hg) have been documented, high THg (3.26 to 60.1 μg/g) sediments had a distinct Hg isotopic composition (δ202Hg of 0.02 ± 0.15‰ and Δ199Hg of -0.07 ± 0.03‰; mean ± 1SD, n=12) compared to sediments from relatively uncontaminated streams in the region (δ202Hg = -1.40 ± 0.06‰ and Δ199Hg of –0.26 ± 0.03‰; mean ± 1SD, n=6). Additionally, several streams that are nearby but do not drain Y12 had sediments with intermediate THg (0.06 to 0.21 μg/g) and anomalous δ202Hg (as low as -5.07‰). We suggest that the low δ202Hg values in these sediments provide evidence for the contribution of an additional Hg source to sediments, possibly derived from atmospheric deposition. In sediments directly downstream of Y12 this third Hg source is not discernible and the Hg isotopic composition can be largely explained by the mixing of low THg sediments with high THg sediments contaminated by Y12 discharges.
Report Numbers
E 1.99:1239629
Subject(s)
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Note
Published through SciTech Connect.
03/03/2014.
Environmental Science and Technology 48 7 ISSN 0013-936X AM
Patrick M. Donovan; Joel D. Blum; Jason D. Demers; Baohua Gu; Scott C. Brooks; John Peryam.
Univ. of Michigan, Ann Arbor, MI (United States)
Funding Information
SC0007042
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