Some aspects of the sulfur cycle in tidal flat areas, and their impact on estuarine water quality Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/dj52w854r

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  • A conceptual model of the tidal flat system, emphasizing the sulfur cycle was presented. Measurements were made of the vertical distribution within tidal flat deposits of total aerobic and sulfate reducing bacteria, total sulfides, redox potential, volatile solids, and particle size. Variations in dissolved oxygen and free sulfides in the water overlying tidal flat deposits were monitored during a tidal cycle, and profiles within this overlying water obtained. An in situ benthic respirometer was used to measure the rate of free sulfide release to the overlying water. Laboratory experiments were designed to investigate the mechanism of sulfide production in tidal flat areas. Growth media were prepared from extracts of sediment and algae collected from tidal flats. Rates of sulfide production in these growth media by mixed cultures of anaerobic bacteria from the same areas were obtained. A mathematical model, based on the common Michaelis-Menton equation, was used to simulate the experiments. A comparison of the simulated and experimental results was presented.
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