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Sediment Phosphorus and Release Rates Daniel White Department of Environmental Science and Biology SUNY Brockport.

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Presentation on theme: "Sediment Phosphorus and Release Rates Daniel White Department of Environmental Science and Biology SUNY Brockport."— Presentation transcript:

1 Sediment Phosphorus and Release Rates Daniel White Department of Environmental Science and Biology SUNY Brockport

2 27 August 2003 Two sediment cores collected from deepest part of the South Basin Sediment cores collected from the mouths of the following streams: –Cottonwood –Sand Point –North McMillan –Sutton Point –Long Point –Graywood

3 Also Collected Dredge samples collected from: –North Gully –Sand Point –Long Point –Graywood

4 Anoxic Release Rate Methods Nurnberg, G Prediction of Phosphorus Release Rates from Total and Reductant-Soluble Phosphorus in Anoxic Lake Sediments. Can. J. Fish. Aquat. Sci. v. 45, p Top of sediment core tube fitted with manifold Filled with anoxic lake water –Lake water purged with N 2 and Na 2 SO 3 Sample collected daily for 15 days –Soluble Reactive Phosphorus (SRP) –Dissolved Oxygen (DO) –pH

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7 Anoxic Release Rate Results Avg. Release Rate: 4.1 mg P/m2/day

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9 Sediment Phosphorus Methods Stream mouth and deep water cores dissected in 1 cm intervals Dried at 30ºC overnight 0.1 g of dry sediment was digested with nitric and sulfuric acid, filtered, neutralized, and diluted to 100 ml of volume Analyzed using ascorbic acid method on a Technicon II Autoanalyzer

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