Reporting of nitrogen-isotope abundances (Technical Report)

To eliminate possible confusion in the reporting of nitrogen-isotope analyses, the Commission on Atomic Weights and Isotopic Abundances recommends that the value 272 be employed for the ¹⁴N/¹⁵N value of N₂ in air for calculating atom percent ¹⁵N from measured δ¹⁵N values.