| P, As, Sb, Mo, and other elements in sedimentary Fe/Mn layers of Lake Baikal. | |
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MedLine Citation:
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PMID: 11871556 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Distinct layers with accumulated iron and manganese oxyhydroxides are found in the recent sediments of Lake Baikal (Siberia). In the South and Central Basins, these concretions accumulate close to the sediment-water interface. In northern Lake Baikal and the area of Academician Ridge, however, massive Fe/Mn crusts are formed within several thousand years at redox fronts 10 to 15 cm below the sediment surface. In some places, precipitated iron and manganese oxyhydroxides are spatially separated. The patterns are a result of secondary iron and manganese oxide precipitation. This natural long-term experiment allows the analysis of competitive adsorption and coprecipitation of trace elements with iron and manganese oxides in sediments. Background concentrations in the sediment of oxoanions (P, As, Sb, Mo); of trace metals (Cr, V, Cu, Zn, Cd, Pb); and of Mg, Ca, Sr, La, Ce, Pr, Nd, and Sm were analyzed by inductively coupled plasma mass spectrometry. Despite the differences in catchment geology of the many tributaries, they are remarkably uniform in sediment cores from different basins of Lake Baikal. Enrichment factors of P and As within Fe crusts revealed concentrations up to 14 and 58 times higher than the background, respectively. No enrichment of P and As was found in the Mn layers. By contrast, Mo accumulated exclusively in the Mn layer with up to 35-fold enrichment. Sb was only slightly enriched in both the Fe and the Mn layers. Among the trace metals studied, only Cd was found at elevated concentrations with a preference for the Mn layer. Ca and Sr were correlated with both Fe and Mn accumulations. The study quantifies the well-known specific adsorption and coprecipitation of P and As at authigenic iron oxides and of Mo on manganese oxides. In addition, the enrichment of Cd at manganese oxides in contrast to the conservative behavior of Zn and Pb reveals highly selective accumulation processes. |
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Authors:
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Beat Müller; Liba Granina; Tobias Schaller; Andrea Ulrich; Bernhard Wehrli |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Environmental science & technology Volume: 36 ISSN: 0013-936X ISO Abbreviation: Environ. Sci. Technol. Publication Date: 2002 Feb |
Date Detail:
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Created Date: 2002-03-01 Completed Date: 2002-09-27 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0213155 Medline TA: Environ Sci Technol Country: United States |
Other Details:
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Languages: eng Pagination: 411-20 Citation Subset: IM |
Affiliation:
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Limnological Research Center, Swiss Federal Institute of Environmental Science and Technology (EAWAG), Kastanienbaum. beat.mueller@eawag.ch |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Environmental Monitoring Geologic Sediments / chemistry* Metals, Heavy / analysis* Trace Elements / analysis* Water Movements Water Pollutants / analysis* |
| Chemical | |
Reg. No./Substance:
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0/Metals, Heavy; 0/Trace Elements; 0/Water Pollutants |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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