Chemical results for interstitial water from organic-rich sediments in the Indian River Lagoon, Florida, show a classic picture of biogeochemical reactions in anoxic environments. Interstitial nitrate was depleted throughout the sediment column and complete sulfate reduction was observed at a depth of <9 cm below the seawater-sediment interface. Interstitial water chlorinity decreased sharply with depth suggesting subsurface occurrence or intrusion of groundwater. Ammonia, phosphate and silica concentrations were high showing significant nutrient regeneration. Dissolved sulfide levels were also high and play a primary role in controlling interstitial water metal concentrations.
Gu, Deyu; Iricanin, Nenad; and Trefry, John H., "The Geochemistry Of Interstitial Water For A Sediment Core From The Indian River Lagoon, Florida" (1987). Ocean Engineering and Marine Sciences Faculty Publications. 111.