Publications Search - Publication Abstract, Illinois State Water Survey

Publication Abstract

Temporal Variability of Arsenic in Municipal Well Water. Holm, Thomas R., Steven D. Wilson, Walton R. Kelly, 2006  Illinois State Water Survey, Champaign, IL,  ISWS CR 2006-07    Full Text Available
Short-term variations in groundwater arsenic (As) concentrations were characterized at four water treatment plants in Illinois and one in Indiana. At each plant, water samples were collected at 45-minute intervals over a six-hour period. Concentrations of As remained steady during the entire test at three facilities. At one facility, the As concentration increased from 58 μg/L in the first sample to 82 μg/L after 2.5 hours. At another facility the As concentration increased from 48 μg/L in the first sample to 68-70 μg/L in all subsequent samples. Variations in As over several years four of these facilities were characterized using data from the Water Survey’s groundwater-quality database. The long-term As variations were unique at each facility. For example, at one facility, the minimum and maximum As concentrations were 20 μg/L and 120 μg/L, a factor of 6. At another facility, the range in As was relatively narrow, with minimum and maximum As concentrations of 34 μg/L and 46 μg/L.

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