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.
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.
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
CIAAW Subcommittee on Stable Isotope
Reference Material Assessment
CIAAW Subcommittee on Natural Assessment of Fundamental Understanding of Isotopes