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Redox Conditions in Selected Principal Aquifers of the United States

June 27, 2009

Reduction/oxidation (redox) processes affect the quality of groundwater in all aquifer systems. Redox processes can alternately mobilize or immobilize potentially toxic metals associated with naturally occurring aquifer materials, contribute to the degradation or preservation of anthropogenic contami-nants, and generate undesirable byproducts, such as dissolved manganese (Mn2+), ferrous iron (Fe2+), hydrogen sulfide (H2S), and methane (CH4). Determining the kinds of redox processes that occur in an aquifer system, documenting their spatial distribution, and understanding how they affect concentrations of natural or anthropogenic contaminants are central to assessing and predicting the chemical quality of groundwater.

This Fact Sheet extends the analysis of U.S. Geological Survey authors to additional principal aquifer systems by applying a framework developed by the USGS to a larger set of water-quality data from the USGS national water databases. For a detailed explanation, see the 'Introduction' in the Fact Sheet.

Publication Year 2009
Title Redox Conditions in Selected Principal Aquifers of the United States
DOI 10.3133/fs20093041
Authors P. B. McMahon, T.K. Cowdery, F. H. Chapelle, B.C. Jurgens
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Fact Sheet
Series Number 2009-3041
Index ID fs20093041
Record Source USGS Publications Warehouse
USGS Organization Colorado Water Science Center