Abstract
Aquatic ecosystems are often contaminated by multiple substances. Nitrate, a common aquatic pollutant, strongly influenced the cycling of arsenic (As) under anoxic conditions in urban Upper Mystic Lake (Massachusetts, USA) by oxidizing ferrous iron [Fe(II)] to produce As-sorbing particulate hydrous ferric oxides and causing the more oxidized As(V), which is more particle-reactive than As(III) under these conditions, to dominate. This process is likely to be important in many natural waters.
Publication types
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Anaerobiosis
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Arsenic / chemistry*
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Arsenic / metabolism
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Bacteria / metabolism*
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Eutrophication
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Ferric Compounds / chemistry
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Ferric Compounds / metabolism
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Ferrous Compounds / chemistry*
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Ferrous Compounds / metabolism
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Fresh Water*
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Geologic Sediments / chemistry
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Massachusetts
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Nitrates / chemistry*
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Nitrates / metabolism*
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Oxidation-Reduction
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Oxygen / chemistry
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Oxygen / metabolism
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Seasons
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Water Microbiology
Substances
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Ferric Compounds
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Ferrous Compounds
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Nitrates
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Arsenic
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Oxygen