Solution Exercise 3

Based on that study, Leenheer and others (1974) made four principal observations:

  1. DOC concentrations in groundwater were generally much lower than commonly found in surface waters, with median concentrations ranging between 0.5 and 0.7 mg/L (41.7 to 58.3 µmol/L);
  2. a shallow aquifer in Florida receiving active recharge from surface-water sources had much higher DOC concentrations (15 mg/L; 1,250 µmol/L) than wells tapping the deeper Floridan aquifer (1.4 to 0.1 mg/L; 117 to 8.3 µmol/L) that was not immediately influenced by surface water;
  3. there were no statistically significant differences in DOC concentrations between aquifers of differing lithologies; and,
  4. there were clear statistical correlations between DOC concentrations, specific conductance, and alkalinity.

Return to Exercise 3


Dissolved Organic Carbon in Groundwater Systems Copyright © 2022 by Francis H. Chapelle. All Rights Reserved.