Number: 2007-028-1-200
Title: Evaluated published isotope
ratio data (2007-2009)
Task Group
Chairman: Michael
Berglund
Members: John
Karl Böhlke, Willi A. Brand, Tyler
B. Coplen, Paul
De Bièvre, John
R. De Laeter, Tiping
P. Ding, Roberto
Gonfiantini, Manfred
Groening, Takafumi Hirata, Norman
E. Holden, Robert
D. Loss, Etienne Roth,
Ronny Schönberg, Robert Vocke, Thomas
Walczyk, Michael
Wieser, Shigekazu Yoneda, and Xiang
Kuo Zhu
Remark: project
2005-027-1-200 covered data 2005-2007
Objective:
Evaluate isotope ratio publications between 2007 and early 2009,
to determine "best isotope ratio measurements" for compilation
and publication in a 2009 TICE, recommend "new" standard
atomic weights, and publish "Atomic Weights of the Elements
2009" in Pure and Applied Chemistry, which will also
include a table of relative atomic masses.
Description:
The aim of the task group is to evaluate isotope ratio publications
between early-2007 and early 2009. The evaluated data will be incorporated
into the CIAAW* Table of Isotopic Composition of the elements (TICE)
and Table of Standard Atomic Weights.
>
*see CIAAW actvities
The Subcommittee on Isotopic Abundance Measurements (SIAM) in CIAAW
recognizes that there are a number of elements that need particular
attention and for which significant publications are expected. These
include Cr and Zn..
In July 2009, task group members will convene in Glasgow, prior
to the IUPAC General Assembly, to evaluate recently published isotope
ratios and resulting atomic-weights reports face-to-face. Detailed
discussions and calculations will be carried out on any chemical
element for which new isotope ratio information exists. Particular
attention will be paid to authors' evaluations of uncertainty, the
selection of materials for analysis, and the variability of isotope
ratio measurements in these materials. In a second meeting in July
2009, task group members will present their recommendations for
adoption of best isotopic ratios and new standard atomic weights
to the Commission on Isotopic Abundances and Atomic Weights at the
General Assembly in Glasgow.
It is anticipated that new standard atomic weights will be recommended,
and a press release announcing these recommendations will be provided
to the IUPAC Secretariat. Subsequently, a publication titled "Atomic
Weights of the Elements 2009" will be prepared for Pure
and Applied Chemistry. Subsequently, publication in J. Phys.
Chem. Ref. Data is anticipated.
