Nitrogen Isotopic Fractionation between Nitric Acid and the Oxides of Nitrogen

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Abstract
The single‐stage nitrogen isotopic separation factor between nitric acid and the oxides of nitrogen has been measured as a function of temperature and nitric acid concentration. Nitric acid molarities were varied from 1.084 to 15.45 and temperatures from 26 to 70°C were used. The separation factor was found to vary from 1.01 to 1.064, with nitrogen‐15 concentrating in the nitric acid phase. The experimental data are compared with values calculated from spectroscopic and chemical data.