An interlaboratory TEX₈₆ and BIT analysis using high-performance liquid chromatography-mass spectrometry
Schouten, Stefan (Koninklijk Nederlands Instituut voor Onderzoek der Zee)
Hopmans, Ellen C. (Koninklijk Nederlands Instituut voor Onderzoek der Zee)
Meer, Jaap van der (Koninklijk Nederlands Instituut voor Onderzoek der Zee)
Mets, Anchelique (Koninklijk Nederlands Instituut voor Onderzoek der Zee)
Bard, Edouard (Centre de Recherche et d'Enseignement de Géosciences de l'Environnement)
Diefendorf, Aaron (Texas A & M University. Department of Oceanography)
Escala Pascual, Marina (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Freeman, Katharine H. (Pennsylvania State University. Department of Geosciences)
Furukawa, Yoshihiro (Tōhoku Daigaku. Department of Earth and Planetary Materials Science)
Huguet, Carme (Huguet Micheo) (University of Washington. School of Oceanography)
Ingalls, Anitra (University of Washington. School of Oceanography)
Ménot-Combes, Guillemette (Centre de Recherche et d'Enseignement de Géosciences de l'Environnement)
Nederbragt, Alexandra J. (University College, London. Department of Earth Sciences)
Oba, Masahiro (Tōhoku Daigaku. Department of Earth and Planetary Materials Science)
Pearson, Ann (Harvard University. Department of Earth and Planetary Sciences)
Pearson, Emma J. (University of Newcastle upon Tyne. School of Geography, Politics and Sociology)
Rosell Melé, Antoni (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Schaeffer, Philippe (Université de Strasbourg I. Institut de Chimie de Strasbourg)
Shah, Sunita R. (Harvard University. Department of Earth and Planetary Sciences)
Shanahan, Timothy M. (Woods Hole Oceanographic Institution)
Smith, Richard W. (Texas A & M University. Department of Oceanography)
Smittenberg, Rienk (Eidgenössische Technische Hochschule Zürich. Geology Department)
Talbot, Helen M. (University of Newcastle upon Tyne. School of Civil Engineering and Geosciences)
Uchida, Masao (Kokuritsu Kankyō Kenkyūjo. Environmental Chemistry Division)
Van Mooy, Benjamin A. S. (Woods Hole Oceanographic Institution)
Yamamoto, Masanobu (Hokkaidō Daigaku. Faculty of Environmental Earth Science)
Zhang, Zhaohui (University of Massachusetts at Amherst. Department of Geosciences)
Sinninghe Damsté, Jaap S. (Koninklijk Nederlands Instituut voor Onderzoek der Zee)

Fecha:	2009
Resumen:	Recently, two new proxies based on the distribution of glycerol dialkyl glycerol tetraethers (GDGTs) were proposed, i. e. , the TEX₈₆ proxy for sea surface temperature reconstructions and the BIT index for reconstructing soil organic matter input to the ocean. In this study, fifteen laboratories participated in a round robin study of two sediment extracts with a range of TEX₈₆ and BIT values to test the analytical reproducibility and repeatability in analyzing these proxies. For TEX₈₆ the repeatability, indicating intralaboratory variation, was 0. 028 and 0. 017 for the two sediment extracts or ±1-2°C when translated to temperature. The reproducibility, indicating among-laboratory variation, of TEX₈₆ measurements was substantially higher, i. e. , 0. 050 and 0. 067 or ±3-4°C when translated to temperature. The latter values are higher than those obtained in round robin studies of Mg/Ca and U₃₇ᵏ' paleothermometers, suggesting the need to primarily improve compatibility between labs. The repeatability of BIT measurements for the sediment with substantial amounts of soil organic matter input was relatively small, 0. 029, but reproducibility was large, 0. 410. This large variance could not be attributed to specific equipment used or a particular data treatment. We suggest that this may be caused by the large difference in the molecular weight in the GDGTs used in the BIT index, i. e. , crenarchaeol versus the branched GDGTs. Potentially, this difference gives rise to variable responses in the different mass spectrometers used. Calibration using authentic standards is needed to establish compatibility between labs performing BIT measurements.
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	TEX₈₆ ; BIT ; Round robin ; HPLC/MS
Publicado en:	Geochemistry, geophysics, geosystems, Vol. 10, Issue 3 (March 2009) , ISSN 1525-2027

DOI: 10.1029/2008GC002221

13 p, 535.1 KB

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