title: Arsenic species and chemistry in groundwater of southeast Michigan.
abstract: Groundwater samples, taken from 73 wells in 10 counties of southeast Michigan in 1997 had arsenic concentrations in the range of 0.5 to 278 microg/L the average being 29 microg/l. About 12% of these wells had arsenic concentrations that exceeded the current USEPA's maximum contaminant level of 50 microg/l. Most (53-98%) of the arsenic detected was arsenite [As(III)] and other observations supported the arsenic species distribution (low redox potential and DO). In shallow groundwater (< 15 m), arsenic concentrations are low likely due to the formation of insoluble ferrosoferric hydroxide complex. In deep groundwater (> 15 m), the concentration of arsenic is possibly controlled by reductive dissolution of arsenic-rich iron hydroxide/oxyhydroxide and dissolution of arsenic sulfide minerals.
authors.affiliation: Future Technology Research Division, Korea Institute of Science and Technology, Seoul. mjkim@kist.re.kr
authors.forename: Myoung-Jin
authors.initials: MJ
authors.lastname: Kim
authors.forename: Jerome
authors.initials: J
authors.lastname: Nriagu
authors.forename: Sheridan
authors.initials: S
authors.lastname: Haack
mesh_terms: D001151:Arsenic / Q000032:analysis; D001152:Arsenicals / Q000032:analysis*; D018053:Arsenites / Q000032:analysis; D005618:Fresh Water / Q000032:analysis*; D008824:Michigan; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D001152:Arsenicals; D018053:Arsenites; D014874:Water Pollutants, Chemical; D001151:Arsenic