The influence of natural organic matter on the adsorption properties of mineral particles in lake water |
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| Authors: | Peter Baccini Erwin Grieder Ruth Stierli Sabine Goldberg |
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| Institution: | (1) Swiss Federal Institute for Water Resources and Water Pollution Control (EAWAG), CH-6047 Kastanienbaum, Switzerland;(2) Department of Soil and Environmental Sciences, University of California Riverside, 92521 CAL, Riverside, USA;(3) Present address: Lake Research Laboratory, EAWAG/ETH, CH-6047 Kastanienbaum, Switzerland |
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| Abstract: | The adsorption characteristics of sediment particles from a prealpine Swiss lake were compared with those of γ-aluminum oxide.
Under lake water conditions, i.e. with particle concentration of 2–16 mg/1 and DOC concentrations of 1–4 mg/1 at pH=8, the
adsorption of copper, zinc and orthophosphate is reduced significantly by the presence of natural organic matter (NOM). It
is postulated that the binding sites of the natural mineral surfaces are occupied almost completely by NOM under natural conditions.
A simple ligand exchange model can explain the observed phenomena. |
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