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Arsenic behavior in newly drilled wells
Myoung-Jin Kim1, Jerome Nriagu, Sheridan Haack
1Division of Civil and Environmental System Engineering, College of Engineering, Korea Maritime University, 1 Domsam-dong, Yeongdo-gu Busan 606-791, Korea. kimmj@hhu.ac.kr
Chemosphere
|May 10, 2003
Summary
Groundwater arsenic levels in Michigan wells are linked to aquifer rock composition and decrease with depth. Reduced groundwater conditions favor arsenic species like As(III), with minimal particulate arsenic found.
Area of Science:
- Environmental Science
- Geochemistry
- Hydrogeology
Background:
- Arsenic contamination in groundwater poses a significant environmental and health risk.
- Understanding arsenic distribution and dissolution is crucial for water resource management.
Purpose of the Study:
- To investigate factors influencing arsenic species distribution in groundwater.
- To determine the relationship between arsenic in aquifer rocks and groundwater.
Main Methods:
- Analysis of inorganic arsenic species and chemical parameters in groundwater.
- Examination of groundwater and core samples from different depths in Michigan wells.
- Measurement of total arsenic and iron concentrations in rock samples.
Main Results:
- Arsenic concentrations in groundwater varied significantly (<1 to 171 microg/l) and correlated with aquifer rock arsenic content.
- Arsenic concentrations decreased with increasing groundwater depth.
- Over 90% of arsenic was found as As(III), indicating reduced groundwater conditions.
- Particulate arsenic was negligible in the studied groundwater samples.
Conclusions:
- Aquifer rock arsenic content is a primary determinant of groundwater arsenic levels.
- Reduced groundwater conditions, characterized by high ferrous ion, low redox potential, and low dissolved oxygen, favor specific arsenic species.
- Depth and geochemical parameters influence arsenic distribution, though trends varied between wells.