Heterogeneously nucleated calcite precipitation in Lake Constance. A short time resolution study |
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| Authors: | Jonna Küchler-Krischun Joachim Kleiner |
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| Institution: | (1) Limnological Institute, University of Constance, Mainaustr. 212, 7750 Konstanz, FRG;(2) Water Control and Research Laboratory, Zweckverband Bodenseewasserversorgung, 7770 Überlingen, FRG;(3) Present address: Klosterpfad 4, 6200 Wiesbaden 16, FRG |
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| Abstract: | Calcite precipitation in spring 1988 in Lake Constance was studied by measuring physical, chemical and biological parameters in daily intervals. Algae triggering calcite precipitation in spring after an induction period of 1 day wereStephanodiscus hantzschii andChlorella spp. whereas no time lag concerning maximum saturation index was observed. Number and size distribution of crystals were determined by microscopical methods. Simple equations were given for estimation of the precipitated mass of calcite by approximating the volume of calcite crystals by simple geometric bodies and multiplying by crystal numbers. Particulate calcium was analysed after dissolving suspended matter and amounted to 90% of inorganic dry weight. Crystals were observed for the first time after dissolved phosphorus was no more detectable. |
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| Keywords: | Calcite precipitation heterogeneous nucleation by algae Lake Constance |
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