Selective chemical extraction of carbonate-associated metals from recent lacustrine sediments |
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| Authors: | Robert Deurer Ulrich Förstner Gisela Schmoll |
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| Institution: | Institut für Sedimentforschung der Universität Heidelberg, D-69 Heidelberg, Im Neuenheimer Feld 236, West Germany |
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| Abstract: | Acidic ion-exchanger was applied to the selective extraction of heavy metals in carbonate phases of recent lake sediments. Cr was not detected and Fe and Cu contents were reduced by factors of three to ten, relative to non-carbonate fractions of the sediment samples. Values obtained for Mn and Zn exemplify the effects of dilution was well as enrichment, both originating from increased carbonate percentages. Determinations on grain-sized fractions from Bodensee samples suggest that elevated inputs of dissolved Zn, which partly originate from human activities, may be immobilized by authigenic carbonate precipitation. |
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