Arsenic Occurrence, Mobility, and Retardation in Sandstone and Dolomite Formations of the Fox River Valley, Eastern Wisconsin

Elevated levels of groundwater arsenic (∼100 μg L-1 = 1.3 × 10-6 M) are found in the Fox River Valley, eastern Wisconsin. The goals of this study were to identify the sources of As contamination and to determine the reactions responsible for As mobilization and retardation in areas lacking a discrete zone of As-enriched sulfides, shown previously to cause elevated arsenic in groundwater. Detailed mineralogical and chemical analyses were...