Logo of the Atomic Weights Commission Logo of the International Union of Pure and Applied Chemistry

    CIAAW Subcommittees

    Subcommittee on Isotopic Abundance Measurements
    Johanna Irrgeher, Austria (Chair)
    Jochen Vogl, Germany (Secretary)

    This subcommittee was created in 1975 during the 28th IUPAC General Assembly (Madrid, Spain) with Paul de Bièvre as its inaugural Chairman.
    The Subcommittee on Isotopic Abundance Measurements (SIAM) consists of a group of experts in isotope mass spectrometry and measurement scientists who are concerned with the measurement of isotopic abundances and variations of those abundances in natural materials. The objective of this subcommittee is to evaluate published, peer-reviewed isotope abundance measurements. As such, it furnishes the technical expertise to the Commission, the IUPAC Inorganic Division, and IUPAC on the isotopic abundances of the elements and the atomic weights of the elements as determined from those abundances.

    Past Chairmen of SIAM include Paul de Bièvre, I. Lynus Barnes, Kevin Rosman, Philip Taylor, John-Karl Böhlke, Michael Berglund, and Ronny Schönberg.


    Subcommittee on Stable Isotope Reference Material Assessment
    Manfred Gröning, Austria (Chair)

    This subcommittee was created in 2009 during the 45th IUPAC General Assembly (Glasgow, UK) with Willi Brand as its inaugural Chairman. The objective of this subcommittee is to evaluate published, peer-reviewed isotope reference materials.


    Subcommittee on Natural Assessment of Fundamental Understanding of Isotopes
    Norman Holden, USA (Chair)
    Tyler Coplen, USA (Secretary)

    This subcommittee was created in 2005 during the 43rd IUPAC General Assembly (Beijing, China). The objective of this subcommittee is to investigate a series of fundamental questions that have been of interest to the CIAAW for many years but which had never adequately been discussed.

    CIAAW Subcommittee on
    Isotopic Abundance Measurements

     Membership for 2016-2017
     Johanna Irrgeher, Chair (Austria)
     Jochen Vogl, Secretary (Germany)
     Paul De Bièvre † (Belgium)
     John-Karl Böhlke (USA)
     Willi A. Brand (Germany)
     Lesley Chesson (USA)
     Tyler Coplen (USA)
     Tiping Ding (China)
     Manfred Gröning (Austria)
     Norman Holden (USA)
     Harro Meijer (The Netherlands)
     Juris Meija (Canada)
     Thomas Prohaska (Austria)
     Thomas Walczyk (Singapore)
     Michael Wieser (Canada)
     Shigekazu Yoneda (Japan)
     Xiang-Kun Zhu (China)


    CIAAW Subcommittee on Stable Isotope
    Reference Material Assessment

     Membership for 2016-2017
     Manfred Gröning, Chair (Austria)
     John-Karl Böhlke (USA)
     Willi A. Brand (Germany)
     Tyler Coplen (USA)
     Tiping Ding (China)
     Thomas Prohaska (Austria)
     Robert D. Vocke (USA)
     Jochen Vogl (Germany)
     Thomas Walczyk (Singapore)


    CIAAW Subcommittee on Natural Assessment of Fundamental Understanding of Isotopes

     Membership for 2016-2017
     Norman Holden, Chair (USA)
     Tyler Coplen, Secretary (USA)
     John-Karl Böhlke (USA)
     Paul De Bièvre † (Belgium)
     Michael Wieser (Canada)