Nitrate Controls on Iron and Arsenic in an Urban Lake

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...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2002-06, Vol.296 (5577), p.2373-2376
Main Authors: Senn, David B., Hemond, Harold F.
Format: Article
Language:English
Subjects:
Anaerobiosis
Arsenic
Arsenic - chemistry
Arsenic - metabolism
Bacteria - metabolism
Control
Deep water
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Eutrophication
Exact sciences and technology
Ferric Compounds - chemistry
Ferric Compounds - metabolism
Ferrous Compounds - chemistry
Ferrous Compounds - metabolism
Fresh Water
Freshwater
Geologic Sediments - chemistry
Groundwater
Iron
Iron (Metal)
Lakes
Mass balance
Massachusetts
Nitrates
Nitrates - chemistry
Nitrates - metabolism
Organic Chemistry
Oxidation
Oxidation-Reduction
Oxygen - chemistry
Oxygen - metabolism
Particulate matter
Pollution, environment geology
Scientific Concepts
Seasons
Sediments
Summer
USA, Massachusetts, Upper Mystic L
Water
Water Microbiology
Water pollution
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Summary: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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1072402