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Variation in groundwater manganese in Finland.
Anne Kousa1, Hannu Komulainen2, Tarja Hatakka3
1Environmental Solutions, Geological Survey of Finland, Kuopio, Finland. anne.kousa@gtk.fi.
Environmental Geochemistry and Health
|July 5, 2020
Summary
Manganese (Mn) in drinking water poses health risks, particularly for children. Groundwater Mn levels vary significantly, influenced by low dissolved oxygen, necessitating comprehensive monitoring beyond single measurements.
Area of Science:
- Environmental Science
- Hydrogeology
- Public Health
Background:
- Manganese (Mn) in drinking water is an emerging health concern, especially for pediatric populations.
- Understanding Mn concentration variability in groundwater is crucial for assessing potential risks.
Purpose of the Study:
- To investigate Mn concentration variations in Finnish well water.
- To identify factors influencing Mn levels in groundwater.
- To assess the reliability of single water sample measurements for Mn status.
Main Methods:
- Analysis of a large dataset (n=5311) of single well water samples.
- Long-term monitoring (n=4607) of annual water samples from selected wells.
- Geochemical analysis including dissolved oxygen, pH, and Mn speciation (total vs. soluble).
Main Results:
- Mn concentrations in well water ranged widely (up to 6560 µg/l).
- Lower dissolved oxygen levels correlated with higher Mn concentrations.
- Significant seasonal and spatial variability in Mn levels was observed, even within the same area.
Conclusions:
- Single Mn measurements may not accurately represent groundwater Mn status.
- Total and soluble Mn concentrations should be measured for a comprehensive assessment.
- Groundwater Mn variability highlights the need for robust monitoring strategies.
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