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

Mischke, Steffen und Zhang, Chengjun und 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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Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Titel:Bias of ostracod stable isotope data caused by drying of sieve residues from water
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Mischke, SteffenInstitute of Geological Sciences, Freie Universität Berlin
Zhang, ChengjunCentre for Arid Environment and Paleoclimate Research, Lanzhou University, Gansu, China
Börner, AnkoNICHT SPEZIFIZIERT
Datum:Oktober 2007
Erschienen in:Journal of Paleolimnology
DOI :10.1007/s10933-007-9160-8
Verlag:Springer Netherlands
Status:veröffentlicht
Stichwörter:Ostracoda - Stable isotope analysis - Cleaning techniques - Geochemistry
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DLR - Teilgebiet (Projekt, Vorhaben):anderes
Standort: Berlin-Adlershof
Institute & Einrichtungen:Optische Informationssysteme
Hinterlegt von: Ute Dombrowski
Hinterlegt am:19 Dez 2007
Letzte Änderung:12 Dez 2013 20:28

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