In the greater Dover area sodium concentrations in ground water from the glauconitic Piney Point Formation commonly exceed 100 parts per million. Investigation of chemical characteristics of the water, and statistical analyses of the results, show that these high concentrations are due to a natural ion-exchange process. Calcium in water replaces sodium in the mineral glauconite and causes the sodium enrichment in ground water.
Please give proper credit to the Delaware Geological Survey.
Spoljaric, N., 1986, Sodium Concentrations in Water from the Piney Point Formation, Dover Area, Delaware: Delaware Geological Survey Report of Investigation 40
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