A method and relevant apparatus for the production of high purity 15N2- enriched nitrogen gas
with (15NH4)2SO4 as starting material are reported. The overall yield of 15N is 96.9%- 98.4%
and the average contents of 15NH3
and 15NO are lower than 1 μg/L. By using this apparatus 0 .5 to 10L of 15Ns gas can be produced. The purity is high enough for the biological nitrogen- fixation studies .