Barium partitioning in coccoliths of Emiliania huxleyi

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• 作者：Gerald Langer ; Gernot Nehrke ; Silke Thoms ; Heather Stoll
• 刊名：Geochimica et Cosmochimica Acta
• 出版年：2009
• 出版时间：15 May 2009
• 年：2009
• 卷：73
• 期：10
• 页码：2899-2906
• 全文大小：306 K

文摘

The coccolithophore Emiliania huxleyi was grown in seawater under different Ba concentrations. The relationship of coccolith Ba/Ca ratio and seawater Ba/Ca ratio was found to be linear. The linear regression yields the apparent Ba exchange coefficient of 0.10. Our data support a recently proposed generic model (Langer G., Gussone N., Nehrke G., Riebesell U., Eisenhauer A., Kuhnert H., Rost B., Trimborn S., and Thoms S. (2006) Coccolith strontium to calcium ratios in Emiliania huxleyi: the dependence on seawater strontium and calcium concentrations. Limnol. Oceanogr. 51, 310–320.) developed for explaining apparent exchange coefficients of metabolically inert divalent trace metals, such as Sr, in E. huxleyi. This model represents the first approach combining cell physiological processes and data from inorganic precipitation experiments, which quantitatively explains coccolith apparent Sr and Ba exchange coefficients.