Journal
MARINE MICROPALEONTOLOGY
Volume 126, Issue -, Pages 42-49Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.marmicro.2016.06.001
Keywords
Foraminifera; Miliolid; Zn/Ca; LA-ICP-MS; Culture experiments; Pollution
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Funding
- Polytechnic University of Marche (Italy)
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The incorporation rate of Zn into the calcareous tests of Pseudotriloculina rotunda was investigated in culture in order to evaluate the possibility of using Zn/Ca ratios as a pollution proxy. Foraminifera were incubated at zinc concentrations up to 10-fold higher than unpolluted seawater (sea + 10 mg Zn/L) during 70 days. New calcite was investigated under the Environmental Scanning Electron Microscope (ESEM), for potential alteration of test structure. Laser ablation-Inductively Coupled Plasma-Mass spectrometry (LA-ICP-MS) was used to quantify Zn contents. The analyses revealed that test structure is not visibly altered by the presence of zinc. However, significant Zn incorporation is detected by the LA-ICP-MS. The zinc partition coefficient, D-Zn, decreases at increasing Zn concentrations (from 4.03 +/- 0.06 to 0.2 +/- 0.01) and the zinc is incorporated into the calcite not necessarily linearly. (C) 2016 Elsevier B.V. All rights reserved.
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