Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 4 4 2007 10.5194/bg-4-493-2007 http://www.biogeosciences.net/4/493/2007/ http://www.biogeosciences.net/4/493/2007/bg-4-493-2007.html http://www.biogeosciences.net/4/493/2007/bg-4-493-2007.pdf 493 504 2007-07-10 Copper incorporation in foraminiferal calcite: results from culturing experiments L. J. de Nooijer nooijer@jamstec.go.jp G. J. Reichart A. Dueñas-Bohórquez M. Wolthers S. R. Ernst P. R. D. Mason G. J. van der Zwaan Dept. of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands now at: Institute for Research on Evolution of the Earth, Japan Agency for Marine Science and Technology (JAMSTEC), 2–15 Natsushima-cho, 237-0061, Yokosuka, Japan A partition coefficient for copper (DCu) in foraminiferal calcite has been determined by culturing individuals of two benthic species under controlled laboratory conditions. The partition coefficient of a trace element (TE) is an emperically determined relation between the TE/Ca ratio in seawater and the TE/Ca ratio in foraminiferal calcite and has been established for many divalent cations. Despite its potential to act as a tracer of human-induced, heavy metal pollution, data is not yet available for copper. Since partition coefficients are usually a function of multiple factors (seawater temperature, pH, salinity, metabolic activity of the organism, etc.), we chose to analyze calcite from specimens cultured under controlled laboratory conditions. They were subjected to different concentrations of Cu2+ (0.1–20 µmol/l) and constant temperature (10 and 20°C), seawater salinity and pH. We monitored the growth of new calcite in specimens of the temperate, shallow-water foraminifer Ammonia tepida and in the tropical, symbiont-bearing Heterostegina depressa. Newly formed chambers were analyzed for Cu/Ca ratios by laser ablation-ICP-MS. 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