Sediment diffusive fluxes of Fe,Mn, and P in a eutrophic lake: Contribution from lateral vs bottom sediments |
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| Authors: | Nelson Belzile Jaime Pizarro Montserrat Filella Jacques Buffle |
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| Institution: | (1) Present address: Department of Chemistry and Biochemistry, Laurentian University, Ramsey Lake Road, P3E 2C6 Sudbury, Ontario, Canada;(2) Depto. Ingenieria Geografica, Facultad de Ingenieria, Universidad de Santiago de Chile, Avda. Lib. Bernardo O'Higgins, 3363 Santiago, Chile;(3) Department of Inorganic, Analytical and Applied Chemistry, University of Geneva, Sciences II 30 quai Ernest Ansermet, 1211 Geneva 4, Switzerland |
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| Abstract: | Water column data and porewater profiles are used to study the chemical evolution with time and with depth of a eutrophic lake. By using different approaches, diffusion fluxes for dissolved iron, manganese and phosphate are calculated and used to describe the processes occurring at the sediment-water interface as well as in the hypolimnion of the lake. These data are used in the elaboration of a qualitative model to describe the chemical behaviour of the sedimentary interface of an anoxic lake with emphasis on the Fe/P/S system. Acorona model is proposed to explain the evolution with time of the diffusion process by estimating the relative contribution of bottom and lateral sediment surfaces to the total fluxes of dissolved elements diffusing from the sediment to the overlying water. As the hypolimnion becomes more anoxic, it has been observed that lateral sediment surfaces (16 to 10 meters in depth) represents a larger supplier of diffusing dissolved components than the bottom sediment portion (bottom to 18 meters). |
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| Keywords: | Iron manganese phosphate sediment diffusion eutrophic lake |
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