Arsenic species and chemistry in groundwater of southeast Michigan

摘要

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 μg/l, the average being 29 μg/l. About 12/100 of these wells had arsenic concentrations that exceeded the current USE- PA's maximum contaminant level of 50 μg/l. Most (53-98/100) 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.