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    An interlaboratory study of TEX86 and BIT analysis using high-performance liquid chromatography–mass spectrometry

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    2008GC002221.pdf (532.5Kb)
    Date
    2009-03-20
    Author
    Schouten, Stefan  Concept link
    Hopmans, Ellen C.  Concept link
    van der Meer, Jaap  Concept link
    Mets, Anchelique  Concept link
    Bard, Edouard  Concept link
    Bianchi, Thomas S.  Concept link
    Diefendorf, Aaron  Concept link
    Escala, Marina  Concept link
    Freeman, Katharine H.  Concept link
    Furukawa, Yoshihiro  Concept link
    Huguet, Carme  Concept link
    Ingalls, Anitra  Concept link
    Menot, Guillemette  Concept link
    Nederbragt, Alexandra J.  Concept link
    Oba, Masahiro  Concept link
    Pearson, Ann  Concept link
    Pearson, Emma J.  Concept link
    Rosell-Mele, Antoni  Concept link
    Schaeffer, Philippe  Concept link
    Shah, Sunita R.  Concept link
    Shanahan, Timothy M.  Concept link
    Smith, Richard W.  Concept link
    Smittenberg, Rienk  Concept link
    Talbot, Helen M.  Concept link
    Uchida, Masao  Concept link
    Van Mooy, Benjamin A. S.  Concept link
    Yamamoto, Masanobu  Concept link
    Zhang, Zhaohui  Concept link
    Sinninghe Damste, Jaap S.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3289
    As published
    https://doi.org/10.1029/2008GC002221
    DOI
    10.1029/2008GC002221
    Keyword
     TEX86; BIT; Round robin; HPLC/MS 
    Abstract
    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 intra-laboratory 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 U37 k′ 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.
    Description
    Author Posting. © American Geophysical Union, 2009. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 10 (2009): Q03012, doi:10.1029/2008GC002221.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Geochemistry Geophysics Geosystems 10 (2009): Q03012
     

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