title: Nitrate controls on iron and arsenic in an urban lake.
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.
authors.affiliation: Parsons Laboratory, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. dbsenn@alum.mit.edu
authors.forename: David B
authors.initials: DB
authors.lastname: Senn
authors.forename: Harold F
authors.initials: HF
authors.lastname: Hemond
mesh_terms: D000693:Anaerobiosis; D001151:Arsenic / Q000737:chemistry* / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism*; D005068:Eutrophication; D005290:Ferric Compounds / Q000737:chemistry / Q000378:metabolism; D005296:Ferrous Compounds / Q000737:chemistry* / Q000378:metabolism; D005618:Fresh Water; D019015:Geologic Sediments / Q000737:chemistry; D008404:Massachusetts; D009566:Nitrates / Q000737:chemistry* / Q000378:metabolism*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry / Q000378:metabolism; D012621:Seasons; D014871:Water Microbiology
chemical_list: D005290:Ferric Compounds; D005296:Ferrous Compounds; D009566:Nitrates; D001151:Arsenic; D010100:Oxygen