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www.biogeosciences-discuss.net/7/953/2010/
doi:10.5194/bgd-7-953-2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
Heavy metal uptake in foraminiferal calcite: results of multi-element culture experiments
1Institute of Mineralogy and Geochemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany
2Alfred Wegener Institute for Polar und Marine Research, Biogeosciences, Bremerhaven, Germany
3Faculty of Earth Sciences, Utrecht University, Utrecht, The Netherlands
Abstract. The incorporation of heavy metals into the test of the shallow water benthic foraminifer Ammonia tepida was investigated under controlled laboratory conditions. Except for the concentrations of the trace elements, all other culture conditions such as pH, temperature and salinity were kept constant. In the experiments, the concentrations of Ni, Cu and Mn were 5, 10, and 20 times higher than those in natural North Sea water, whereas in a control experiment foraminifera were cultured in filtered natural North Sea water. Concentrations of Cu and Ni from newly grown chambers were determined by means of both μ-synchrotron XRF and laser ablation inductively coupled plasma mass spectroscopy (LA-ICP-MS). Both independent analytical approaches agreed within the analytical uncertainty intervals. The calculated partition coefficients were 0.17±0.09 and 1.3±0.7 for Cu and Ni, respectively. Potential toxic and/or chemical competition effects might have lead to a decreasing incorporation rate of Cu and Ni into the calcite of the specimens of the tank with the highest chemical concentrations. Mn showed great scattering in the aquarium with the 20-fold higher element concentrations potentially due to antagonism effects with Cu. Nevertheless, the established partition coefficients now open the way for reconstructing past concentrations for these elements in sea water.
Discussion Paper (PDF, 704 KB) Interactive Discussion (Closed, 4 Comments) Final Revised Paper (BG)
Notice on Discussion StatusCitation: Munsel, D., Kramar, U., Dissard, D., Nehrke, G., Berner, Z., Bijma, J., Reichart, G.-J., and Neumann, T.: Heavy metal uptake in foraminiferal calcite: results of multi-element culture experiments, Biogeosciences Discuss., 7, 953-977, doi:10.5194/bgd-7-953-2010, 2010. Bibtex EndNote Reference Manager XML
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