ISOTOPIC COMPOSITIONS OF THE ELEMENTS 1989 (REPRINTED FORM PURE AND APPL CHEM, VOL 63, PG 991, 1991)

The Subcommittee for Isotopic Abundance Measurements (SIAM) of the IUPAC Commission on Atomic Weights and Isotopic Abundances has carried out its biennial review of isotopic compositions, as determined by mass spectrometry and other relevant methods. The Subcommittee's critical evaluation of the published literature element by element forms the basis of the Table of Isotopic Compositions of the Elements as Determined by Mass Spectrometry 1989, which is presented in this Report. Atomic Weights calculated from the tabulated isotopic abundances are consistent with A(r)(E) values listed in the Table of Standard Atomic Weights 1989.