Isotopic Compositions of the Elements 2009: IUPAC-CIAAW Standard Reference

The Commission on Isotopic Abundances and Atomic Weights (CIAAW) of IUPAC completed its last update of isotopic compositions in 2009. This table presents evaluated data from the 'best measurement' of isotope abundances for each element, along with representative abundances and uncertainties for normal terrestrial materials. The data is consistent with the standard atomic weights recommended by CIAAW in 2007.

Use Cases

• Calibrating mass spectrometry instruments based on the 'best measurement' reference data.
• Calculating standard atomic weights for chemical elements based on the representative isotope abundances.
• Modeling geochemical processes using the evaluated uncertainties for isotopic variations in terrestrial materials.
• Benchmarking theoretical models of nuclear structure against the critically evaluated experimental data.

Strengths

• Data is based on a critical evaluation of published literature by the authoritative IUPAC commission.
• Includes both 'best measurement' values and representative abundances with uncertainties for each element.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Last update date is unknown; freshness unverified.
• Column-level documentation is absent; field semantics must be inferred after download.

Provenance

Source

Commission on Isotopic Abundances and Atomic Weights (CIAAW) of the International Union of Pure and Applied Chemistry (IUPAC)

Collection Method

Critical evaluation of published literature using isotope-ratio mass spectrometry.

Time Range

Data reflects the state of knowledge as of 2009.