Abstract
Water column ammonium concentrations were determined at several stations at or near the sewage sludge dump site in the New York Bight apex on 30 and 31 July, (1973) and also at several stations located on a perimeter surrounding the dump area. Parachute drogues were used to track the movement of water over a 31-hour period. Within the dump site, ammonium concentrations were patchy and usually increased from surface to bottom with concentrations in the ranges of less than 1 μM and 1–9 μM, respectively. However, at one station that had recently received sludge input, the surface ammonium concentration was over 500 μM and the bottom concentration was about 200 μM. All except two background stations showed no significant vertical variation in ammonium. The observations suggest that sludge dumping increases ammonium content of the water column, but that high levels probably do not persist for long periods.
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