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Vol. 30 No. 2
March-April 2008

The Project Place | Information about new, current, and complete IUPAC projects and related initiatives
See also www.iupac.org/projects

Provisional Recommendations

Explanatory Glossary of Terms Used in Expression of Relative Isotope Ratios and Gas Ratios

To minimize confusion in the expression of measurements of isotope and gas ratios, a glossary based on recommendation by the Commission on Isotopic Abundances and Atomic Weights of the IUPAC is presented. Entries in the glossary are consistent with the SI system of units or with recommendations of the Commission. The recommendations presented herein are designed to clarify expression of quantities related to measurement of isotope and gas ratios by ensuring that quantity equations and not numerical-value equations are used to define quantities. Examples of column headings consistent with SI recommendations and examples of various deprecated usages connected with the terms recommended are presented herein.

Comments by 31 May 2008
Dr. Tyler B. Coplen
U.S. Geological Survey
431 National Center
12201 Sunrise Valley Drive
Reston, VA 20192, USA
TEL: +1 703-648-5862
FAX: +1 703-648-5832
E-MAIL: tbcoplen@usgs.gov

www.iupac.org/reports/provisional/abstract08/coplen_310508.html


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