Journal
ENVIRONMENTAL POLLUTION
Volume 120, Issue 2, Pages 379-390Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0269-7491(02)00114-8
Keywords
arsenic; groundwater; speciation geochemistry; Michigan
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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 mug/l, the average being 29 mug/l. About 12% of these wells had arsenic concentrations that exceeded the current USEPA's maximum contaminant level of 50 mug/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 in), the concentration of arsenic is possibly controlled by reductive dissolution of arsenic-rich iron hydroxide/oxyhydroxide and dissolution of arsenic sulfide minerals. (C) 2002 Elsevier Science Ltd. All rights reserved.
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