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On behalf of the International Union of Pure andApplied Chemistry (IUPAC), and in particular its Com-mission on Atomic Weights and Isotopic Abundances, Ishould like to inform the readers of the Journal ofResearch of the National Institute of Standards andTechnology of the following, based on Refs. [1] and [2].To eliminate possible confusion in the reporting ofisotopic abundances on noncorresponding scales, theCommission on Atomic Weights and Isotopic Abun-dances of the International Union of Pure and AppliedChemistry (IUPAC) recommended at the IUPAC 37thGeneral Assembly in August 1993 at Lisbon, Portugal,that (i)

Letter to the Editor: New Iupac Guidelines for the Reporting of Stable Hydrogen, Carbon, and Oxygen Isotope-Ratio Data