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@ARTICLE{Chapligin:17110,
      author       = {Chapligin, B. and Leng, M.J. and Webb, E. and Alexandre, A.
                      and Dodd, J.P. and Ijiri, A. and Lücke, A. and Shemesh, A.
                      and Abelmann, A. and Herzschuh, U. and Longstaffe, F.J. and
                      Meyer, H. and Moschen, R. and Okazaki, Y. and Rees, N.H. and
                      Sharp, Z.D. and Sloane, H.J. and Sonzogni, C. and Swann,
                      G.E.A. and Sylvestre, F. and Tyler, J.T. and Yam, R.},
      title        = {{I}nter-laboratory comparison of oxygen isotope
                      compositions from biogenic silica},
      journal      = {Geochimica et cosmochimica acta},
      volume       = {75},
      issn         = {0016-7037},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {PreJuSER-17110},
      pages        = {7242 - 7256},
      year         = {2011},
      note         = {This work was part of a Ph.D. research project funded by
                      the German Research Foundation with the research grants DFG
                      Me 3266-1-1 and 3266-1-2. We would like to express our
                      sincere gratitude to all technical staff and laboratory
                      assistants involved in the analyses including Kim Law and
                      Lisa Munro (UWO), Irena Brailovski (WIS) and Franz Leistner
                      (FZJ), Lutz Schoenicke and Cindy Springer (AWI). In
                      addition, we thank Helga Kemnitz and Rudolph Naumann from
                      the German Research Center for Geosciences for their SEM and
                      XRD support, respectively. Funding for GEAS was provided by
                      a NERC postdoctoral fellowship award (NE/F012969/1). The
                      research contributions of EAW and FJL were supported by the
                      Natural Sciences and Engineering Research Council of
                      Canada.},
      abstract     = {Several techniques have been introduced in the last decades
                      for the dehydration and release of O-2 from biogenic silica
                      (opal-A) for oxygen-isotope analysis. However, only one
                      silica standard is universally available: a quartz standard
                      (NBS28) distributed by the IAEA, Vienna. Hence, there is a
                      need for biogenic silica working standards. This paper
                      compares the existing methods of oxygen-isotope analyses of
                      opal-A and aims to characterize additional possible working
                      standards to calibrate the delta O-18 values of biogenic
                      silica. For this purpose, an inter-laboratory comparison was
                      organized. Six potential working standard materials were
                      analysed repeatedly against NBS28 by eight participating
                      laboratories using their specific analytical methods. The
                      materials cover a wide range of delta O-18 values (+23 to
                      +43 parts per thousand) and include diatoms (marine,
                      lacustrine), phytoliths and synthetically-produced hydrous
                      silica. To characterize the proposed standards, chemical
                      analyses and imaging by scanning electron microscopy (SEM)
                      were also performed. Despite procedural differences at each
                      laboratory, all methods are in reasonable agreement with a
                      standard deviation (SD) for delta O-18 values between 0.3
                      parts per thousand and 0.9 parts per thousand (1 sigma).
                      Based on the results, we propose four additional biogenic
                      silica working standards (PS1772-8: 42.8 parts per thousand;
                      BFC: 29.0 parts per thousand; MSG60: 37.0 parts per
                      thousand; G95-25-CL leaves: 36.6 parts per thousand) for
                      delta O-18 analyses, available on request through the
                      relevant laboratories. (C) 2011 Elsevier Ltd. All rights
                      reserved.},
      keywords     = {J (WoSType)},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Geochemistry $\&$ Geophysics},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000296579600031},
      doi          = {10.1016/j.gca.2011.08.011},
      url          = {https://juser.fz-juelich.de/record/17110},
}