 |
| Titel |
Heavy metal incorporation in foraminiferal calcite: results from multi-element enrichment culture experiments with Ammonia tepida |
| VerfasserIn |
D. Munsel, U. Kramar, D. Dissard, G. Nehrke, Z. Berner, J. Bijma, G.-J. Reichart, T. Neumann |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 8 ; Nr. 7, no. 8 (2010-08-06), S.2339-2350 |
| Datensatznummer |
250004925
|
| Publikation (Nr.) |
 copernicus.org/bg-7-2339-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| The incorporation of heavy metals into carbonate tests of the shallow water
benthic foraminifer Ammonia tepida was investigated under controlled
laboratory conditions. Temperature, salinity, and pH of the culture solutions
were kept constant throughout the duration of this experiment, while trace
metal concentrations were varied. Concentrations of Ni, Cu, and Mn were set
5-, 10-, and 20 times higher than levels found in natural North Sea water;
for reference, a control experiment with pure filtered natural North Sea
water was also analysed. The 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). The
results of both independent analytical techniques agreed within the
analytical uncertainty. In general, the concentration of the analysed
elements in the tests increased in line with their concentration in the
culture solutions. Potential toxic and/or chemical competition effects might
have resulted in the decreased incorporation of Ni and Cu into the calcite of
the specimens exposed to the highest elemental concentrations. Mn
incorporation exhibited large variability in the experiment with the 20-fold
increased element concentrations, potentially due to antagonistic effects
with Cu. The partition coefficients of Cu and Ni were calculated to be
0.14 ± 0.02 and 1.0 ± 0.5, respectively, whereas the partition
coefficient of Mn was estimated to be least 2.4. These partition coefficients
now open the way for reconstructing past concentrations for these elements in
sea water. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|