Factors that influence sulfide production in an estuarine environment Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2b88qg89m

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  • Core samples from five sites in the Yaquina and Coos Estuary were assayed for vertical distribution of total sulfides, percent volatile solids, redox potential, particle size, total aerobic and sulfate reducing bacteria. Higher total sulfide levels were found at sites having more than four percent volatile solids, redox potential below -100 millivolt, and with more than 80 percent fine particles. Free sulfides and dissolved oxygen were found simultaneously in the water one cm. above the sediment at site 5 during monitoring. One mg./l or higher levels of free sulfides were found sometimes even at supersaturated levels of dissolved oxygen. Free sulfides were found at site 3 only when the surface was disturbed and not at all at site 1. Extract experiments were run to determine organic carbon utilization and sulfide production. Aerobically 61 to 73 percent of the total carbon was utilized. Anaerobically 41 to 74 percent at 25°C and 33 to 55 percent at 15°C was utilized. There was a higher percentage of utilization when sulfides were not produced. Organic carbon levels above 350 mg./l and sulfate levels above 800 mg./l were needed to produce sulfides. Only samples where the Eh dropped below 0 were any significant amounts of sulfides produced. High levels of sulfides appear to delay, but not to reduce the rate of sulfide production.
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