Water hardness

Indicator of the concentration of alkaline salts in water, mainly calcium and magnesium, as a measure of water quality.
This category is also used for hardness (water).
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Environmental characteristics of the abandoned Greenwood Mine area, Prince William Forest Park, Virginia; implications for mercury geochemistry

Water quality data for the area include pH, dissolved oxygen, alkalinity, total acid soluble and dissolved major and trace element concentrations for sites around the mine workings.