Influence of groundwater recharge and well characteristics on dissolved arsenic concentrations in southeastern Michigan groundwater

Arsenic concentrations exceeding 10 μg/l, the United States maximum contaminant level and the World Health Organization guideline value, are frequently reported in groundwater from bedrock and unconsolidated aquifers of southeastern Michigan. Although arsenic-bearing minerals (including arsenian pyr...

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Veröffentlicht in:Environmental geochemistry and health 2009-02, Vol.31 (1), p.147-157
Hauptverfasser: Meliker, Jaymie R, Slotnick, Melissa J, Avruskin, Gillian A, Haack, Sheridan K, Nriagu, Jerome O
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container_start_page 147
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creator Meliker, Jaymie R
Slotnick, Melissa J
Avruskin, Gillian A
Haack, Sheridan K
Nriagu, Jerome O
description Arsenic concentrations exceeding 10 μg/l, the United States maximum contaminant level and the World Health Organization guideline value, are frequently reported in groundwater from bedrock and unconsolidated aquifers of southeastern Michigan. Although arsenic-bearing minerals (including arsenian pyrite and oxide/hydroxide phases) have been identified in Marshall Sandstone bedrock of the Mississippian aquifer system and in tills of the unconsolidated aquifer system, mechanisms responsible for arsenic mobilization and subsequent transport in groundwater are equivocal. Recent evidence has begun to suggest that groundwater recharge and characteristics of well construction may affect arsenic mobilization and transport. Therefore, we investigated the relationship between dissolved arsenic concentrations, reported groundwater recharge rates, well construction characteristics, and geology in unconsolidated and bedrock aquifers. Results of multiple linear regression analyses indicate that arsenic contamination is more prevalent in bedrock wells that are cased in proximity to the bedrock-unconsolidated interface; no other factors were associated with arsenic contamination in water drawn from bedrock or unconsolidated aquifers. Conditions appropriate for arsenic mobilization may be found along the bedrock-unconsolidated interface, including changes in reduction/oxidation potential and enhanced biogeochemical activity because of differences between geologic strata. These results are valuable for understanding arsenic mobilization and guiding well construction practices in southeastern Michigan, and may also provide insights for other regions faced with groundwater arsenic contamination.
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subjects Aquifer systems
Aquifers
Arsenic
Arsenic - analysis
Bedrock
bladder
Contaminants
Contamination
Correlation analysis
Earth and Environmental Science
Environment
Environmental Chemistry
Environmental Health
Environmental Monitoring
Fresh Water - chemistry
Geochemistry
Geology
Groundwater
Groundwater recharge
Health and Pathology
Michigan
Mining
Mobilization and transport
neoplasms
Original Paper
Oxidation-Reduction
Public Health
Pyrite
Recharge
Regression Analysis
Sandstone
Soil Science & Conservation
Solubility
Studies
Terrestrial Pollution
Unconsolidated aquifers
Water Movements
Water Pollutants, Chemical - analysis
Water pollution
Water Supply - analysis
Water Supply - standards
Wells
title Influence of groundwater recharge and well characteristics on dissolved arsenic concentrations in southeastern Michigan groundwater
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