Commission on Isotopic Abundances and Atomic Weights
| Abbreviation | CIAAW |
|---|---|
| Formation | 1899 |
| Type | International scientific organization |
| Purpose | To provide internationally recommended values of isotopic composition and atomic weights of elements |
Region served | Worldwide |
Official language | English |
Chair | Johanna Irrgeher |
Secretary | Jochen Vogl |
Parent organization | IUPAC (since 1920) |
| Website | www |
The Commission on Isotopic Abundances and Atomic Weights (CIAAW) is an international scientific committee of the International Union of Pure and Applied Chemistry (IUPAC) under its Division of Inorganic Chemistry.[1] Since 1899, it is entrusted with periodic critical evaluation of atomic weights of chemical elements and other cognate data, such as the isotopic composition of elements.[2] The biennial CIAAW Standard Atomic Weights are accepted as the authoritative source in science and appear worldwide on the periodic table wall charts.[3]
The use of CIAAW Standard Atomic Weights is also required legally, for example, in calculation of calorific value of natural gas (ISO 6976:1995), or in gravimetric preparation of primary reference standards in gas analysis (ISO 6142:2006). In addition, until 2019 the definition of the Kelvin, the SI unit for thermodynamic temperature, made direct reference to the isotopic composition of oxygen and hydrogen as recommended by CIAAW.[4] The latest CIAAW report was published in May 2022.[5]
- ^ "IUPAC Commission on Isotopic Abundances and Atomic Weights". ciaaw.org. Retrieved 2024-08-21.
- ^ "CIAAW | Commission on Isotopic Abundances and Atomic Weights". ciaaw.org. Retrieved 2024-08-21.
- ^ "IUPAC, Oxford Reference". Archived from the original on 2013-09-22.
{{cite journal}}: Cite journal requires|journal=(help) - ^ "Clarification of the definition of the kelvin, unit of thermodynamic temperature" (PDF). BIPM. 2005. Archived (PDF) from the original on 2013-06-26.
- ^ Thomas Prohaska; Johanna Irrgeher; Jacqueline Benefield; John Karl Boehlke; Lesley Chesson; Tyler B Coplen; Tiping Ding; Philip J H Dunn; Manfred Gröning; Norman E Holden; Harro A J Meijer; Heiko Moossen; Antonio Possolo; Yoshio Takahashi; Jochen Vogl; Thomas Walczyk; Jun Wang; Michael Wieser; Shigekazu Yoneda; Xiangkun Zhu; Juris Meija (2022). "Standard Atomic weights of the elements 2021 (IUPAC Technical Report)". Pure Appl. Chem. 94 (5): 573–600. doi:10.1515/pac-2019-0603.