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000017110 0247_ $$2DOI$$a10.1016/j.gca.2011.08.011
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000017110 084__ $$2WoS$$aGeochemistry & Geophysics
000017110 1001_ $$0P:(DE-HGF)0$$aChapligin, B.$$b0
000017110 245__ $$aInter-laboratory comparison of oxygen isotope compositions from biogenic silica
000017110 260__ $$aNew York, NY [u.a.]$$bElsevier$$c2011
000017110 300__ $$a7242 - 7256
000017110 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000017110 440_0 $$010821$$aGeochimica et Cosmochimica Acta$$v75$$x0016-7037$$y22
000017110 500__ $$3POF3_Assignment on 2016-02-29
000017110 500__ $$aThis 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.
000017110 520__ $$aSeveral techniques have been introduced in the last decades for the dehydration and release of O-2 from biogenic silica (opal-A) for oxygen-isotope analysis. However, only one silica standard is universally available: a quartz standard (NBS28) distributed by the IAEA, Vienna. Hence, there is a need for biogenic silica working standards. This paper compares the existing methods of oxygen-isotope analyses of opal-A and aims to characterize additional possible working standards to calibrate the delta O-18 values of biogenic silica. For this purpose, an inter-laboratory comparison was organized. Six potential working standard materials were analysed repeatedly against NBS28 by eight participating laboratories using their specific analytical methods. The materials cover a wide range of delta O-18 values (+23 to +43 parts per thousand) and include diatoms (marine, lacustrine), phytoliths and synthetically-produced hydrous silica. To characterize the proposed standards, chemical analyses and imaging by scanning electron microscopy (SEM) were also performed. Despite procedural differences at each laboratory, all methods are in reasonable agreement with a standard deviation (SD) for delta O-18 values between 0.3 parts per thousand and 0.9 parts per thousand (1 sigma). Based on the results, we propose four additional biogenic silica working standards (PS1772-8: 42.8 parts per thousand; BFC: 29.0 parts per thousand; MSG60: 37.0 parts per thousand; G95-25-CL leaves: 36.6 parts per thousand) for delta O-18 analyses, available on request through the relevant laboratories. (C) 2011 Elsevier Ltd. All rights reserved.
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000017110 7001_ $$0P:(DE-HGF)0$$aLeng, M.J.$$b1
000017110 7001_ $$0P:(DE-HGF)0$$aWebb, E.$$b2
000017110 7001_ $$0P:(DE-HGF)0$$aAlexandre, A.$$b3
000017110 7001_ $$0P:(DE-HGF)0$$aDodd, J.P.$$b4
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000017110 7001_ $$0P:(DE-HGF)0$$aAbelmann, A.$$b8
000017110 7001_ $$0P:(DE-HGF)0$$aHerzschuh, U.$$b9
000017110 7001_ $$0P:(DE-HGF)0$$aLongstaffe, F.J.$$b10
000017110 7001_ $$0P:(DE-HGF)0$$aMeyer, H.$$b11
000017110 7001_ $$0P:(DE-HGF)0$$aMoschen, R.$$b12
000017110 7001_ $$0P:(DE-HGF)0$$aOkazaki, Y.$$b13
000017110 7001_ $$0P:(DE-HGF)0$$aRees, N.H.$$b14
000017110 7001_ $$0P:(DE-HGF)0$$aSharp, Z.D.$$b15
000017110 7001_ $$0P:(DE-HGF)0$$aSloane, H.J.$$b16
000017110 7001_ $$0P:(DE-HGF)0$$aSonzogni, C.$$b17
000017110 7001_ $$0P:(DE-HGF)0$$aSwann, G.E.A.$$b18
000017110 7001_ $$0P:(DE-HGF)0$$aSylvestre, F.$$b19
000017110 7001_ $$0P:(DE-HGF)0$$aTyler, J.T.$$b20
000017110 7001_ $$0P:(DE-HGF)0$$aYam, R.$$b21
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