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After two decades a second anchor for the VPDB δ13C scale

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After two decades a second anchor for the VPDB [delta]13C scale Guest Editorial anchor for the VPDB d13C ehre3, Manfred Gro¨ning4, Harro A. J. Meijer5, Box 100164, 07701 Jena, Germany ile Isotope, Permoserstrasse 15, 04318 Leipzig, Germany P.O. Box 100, A-1400 Vienna, Austria n, Nijenborgh 4, 9747 AG Groningen, The Netherlands ogy Laboratory, Mail Stop 8980, Gaithersburg, MD 20899, USA d Technology Laboratory, Mail Stop 8371, Gaithersburg, MD 20899, USA Germany; US Geological Survey, Reston, VA, USA) per- �46.6% was assigned to L-SVEC lithium carbonate.8 The results (Table 1) were provided to the International Union of Pure and Applied Chemistry (IUPAC). RECOMMENDATIONS RAPID COMMUNICATIONS IN MASS SPECTROMETRY Rapid Commun. Mass Spectrom. 2006; 20: 3165–3166 Published online in Wiley InterScience ( DOI: 10.1002/rcm.2727 Name Description d13C� 103 NBS 18 calcium carbonate �5.01 National Center, Reston, VA 20192, USA. E-mail: [email protected] yThis article is a U.S. Government work and is in the public domain in the U.S.A. *Correspondence to: T. B. Coplen, US Geological Survey, 431 formed analytical measurements. Participants at the US National Institute of Science and Technology (NIST) headed the task to estimate consensus means and uncertainties using multivariate Bayesian techniques. Collectively, the labora- tories performed 1055 state-of-the-art continuous-flow elemental-analyzer mass spectrometry measurements using the general method of Qi et al.5 on selected organic and inorganic carbon isotopic reference materials. Aims of the work included determining consensus d13C values of stable carbon isotopic reference materials and confirming that isotopic materials measured in this study are isotopically homogeneous in amounts used in continuous-flow methods [m(C) of approximately �40mg]. Based on high precision mass spectrometric measurements,6,7 a consensus value of IAEA-CO-8 calcium carbonate �

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