Indian River Lagoon Project


The ammonia system was deployed for 20 days from September 23 to October 12, 2013 near a Land/Ocean Biogeochemical Observatory (LOBO) station at Harbor Branch Oceanographic Institute (HBOI), Florida Atlantic University for near real-time ammonium concentration measurement every 30 minutes in the Indian River Lagoon (IRL). From past 2 years IRL-monitoring of HBOI, ammonium dominates the DIN pool in the lagoon. High ammonium concentrations in tributaries and tidal creeks in residential areas with high densities of septic tanks indicate that much of the ammonium is from septic tank effluent. This is supported by stable nitrogen isotope data that shows highly enriched values characteristic of sewage nitrogen in groundwater, surface water and algal tissue. 

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