New IUPAC Guidelines for the Reporting of Stable Hydrogen, Carbon, and OxygenIsotope-Ratio Data. Letter to the Editor

摘要

To eliminate possible confusion in the reporting of isotopic abundances onnoncorresponding scales, the Commission on Atomic Weights and Isotopic Abundances of the Internationl Union of Pure and Allied Chemistry (IOPAC) recommended at the IUPAC 37th General Assembly in August 1993 at Libson, Portugal, that (1) 2H/1H relative ratios of all substances be expressed relative to VSMOW (Vienna Standard Mean Ocean Water) on a scale such that 2H/1H of SLAP (Standard Light Antarctic Precipitation) is 0.572 times that of VOSMOW; (2) 13C/12C relative ratios of all substances be expressed relative to VPDB (Vienna Peedee belemnite) on a scale such that 13C/12C of NBS-lime-stone (RM 8544) is 1.00195 times that of VPDB; and (3) 18O/16O ratios of all substances be expressed relative to either VSMOW or VPDB an scales such that 18O/16O of SLAP is 0.9445 times that of VSMOW.