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Bias of ostracod stable isotope data caused by drying of sieve residues from water

Mischke, Steffen and Zhang, Chengjun and Börner, Anko (2007) Bias of ostracod stable isotope data caused by drying of sieve residues from water. Journal of Paleolimnology. Springer Netherlands. DOI: 10.1007/s10933-007-9160-8.

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Abstract

Stable isotope analysis of ostracod shells is used routinely for palaeoenvironmental studies of ostracod-bearing records. Sample treatment usually involves the disaggregation of sediments and sieving; before the sieving residues were washed with water onto petri dishes and oven-dried. In our study, we compared δ18O and δ13C values of shells that were oven-dried from water and from ethanol alternatively. Large isotopic differences of up to 3‰ were determined for δ18O values, whereas differences in δ13C values were less pronounced with differences of up to 1.6‰. Stable isotope values of shells dried from water were lower for both oxygen and carbon as a result of calcite crystals precipitated on the shell surfaces during the drying process. Therefore, ostracod shells for stable isotope analysis should not be prepared by drying from water. Instead, shells should be dried from ethanol to obtain reliable stable isotope data; likewise freeze-drying is expected to provide trustworthy results.

Document Type:Article
Title:Bias of ostracod stable isotope data caused by drying of sieve residues from water
Authors:
AuthorsInstitution or Email of Authors
Mischke, SteffenInstitute of Geological Sciences, Freie Universität Berlin
Zhang, ChengjunCentre for Arid Environment and Paleoclimate Research, Lanzhou University, Gansu, China
Börner, AnkoUNSPECIFIED
Date:October 2007
Journal or Publication Title:Journal of Paleolimnology
DOI:10.1007/s10933-007-9160-8
Publisher:Springer Netherlands
Status:Published
Keywords:Ostracoda - Stable isotope analysis - Cleaning techniques - Geochemistry
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignement
DLR - Program:no assignment
DLR - Research theme (Project):other
Location: Berlin-Adlershof
Institutes and Institutions:Optical Information Systems
Deposited By: Ute Dombrowski
Deposited On:19 Dec 2007
Last Modified:12 Dec 2013 20:28

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