SILICA AND CHLORIDE IN INTERSTITIAL WATERS OF RIVER AND LAKE SEDIMENTS1

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Abstract
Interstitial waters of sediment from the Concord River, Massachusetts; Neuse River, North Carolina; and Seneca Lake, New York, have higher concentrations of dissolved silica and chloride and lower pH values than coexisting surface waters in equilibrium with the atmosphere. The highest silica concentrations in the interstitial waters (20–50 mg/liter greater than coexisting river water) are observed in organic bog sediments and in river sediments at depths of 6 cm or more below the sediment‐water interface. The high silica and low pH values appear to be primarily a result of the decomposition of organic matter. The high chloride concentrations are attributed to evaporation of rain water solutions in the soil.

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