Other
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..925e&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 40, Issue 8, pp.925-934
Other
9
Scientific paper
As part of a study of early diagenesis in anaerobic lake sediments the major ions and P, Fe, Mn, pS, p and pH were measured in interstitial waters of cores from eutrophic Greifensee in north-central Switzerland. A guide for the interpretation of such data is thermodynamic equilibrium between the dissolved species and mineral phases. The results show that CaCO 3 , which precipitates from the lake water, dissolves rapidly in the CO 2 -rich interstitial waters resulting in equilibrium with calcite in the top few centimeters of sediment. Siderite, on the other hand, is nearly ten-fold supersaturated 20-30 cm below the surface. Iron monosulfides are metastable in the surface 10-20 cm of sediment and pS and p results indicate equilibrium between polysulfides and orthorhombic sulfur. Vivianite appears to be limiting the solubility of phosphate below a few centimeters of sediment. The above processes are highly interactive, especially in the case of ferrous iron, with one result being a two order of magnitude decrease in dissolved phosphate in a depth interval of 20cm in the interstitial waters.
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