Sources, input pathways, and distributions of Fe, Cu, and Zn in a Chesapeake Bay tidal freshwater marsh |
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| Authors: | M.A. Knight G. B. Pasternack |
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| Affiliation: | (1) Department of Geography, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA, TP;(2) Department of Land, Air, and Water Resources, University of California, One Shields Avenue, Davis, CA 95616-8626, USA e-mail: gpast@ucdavis.edu Tel.: +1-530-7549243 Fax: +1-530-7525262, US |
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| Abstract: | Tidal freshwater marshes exist at the interface between watersheds and estuaries, and thus may serve as critical buffers protecting estuaries from anthropogenic metal pollution. Bi-weekly samples of newly deposited marsh sediments were collected and analyzed for Cu, Zn, and Fe concentrations over 21 months from July 1995 to March 1997 in five distinct habitats at the head of Bush River, Maryland. Bi-weekly anthropogenic metal enrichments ranged from 0.9–4.7. Anthropogenic excess metal loadings averaged over 1996 ranged from 6–306 and 25–1302 μg cm−2 year−1 between sites for Cu and Zn, respectively. Based on Fe-normalized trace metal signatures, Susquehanna River sediment does not significantly contribute to upper Bush River. Organic matter was found to dilute total metal concentrations, whereas past studies suggested organics enhance labile metal content. Analysis of metal input pathways shows that marsh metals are primarily imported from nearby subtidal accumulations of historic watershed material by tidal flushing. Received: 29 April 1999 / Accepted: 7 December 1999 |
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| Keywords: | Chesapeake Bay Marsh sedimentation Metal accumulation Trace metals |
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