Other gases in the nitric oxide by Lunge nitrometer method

Studies on the determination of nitrogen in nitrocellulose and nitric acid. II

Abstract

After treating nitric oxide evolved from the Lunge nitrometer with ferrous sulfate solution, the residual gas was used for the mass spectrometry. Although there were great differences in the amount of residual gas, depending upon whether the solution had been boiled or not before the gas was absorbed, the major element in either case was nitrogen. The ratio of N₂/Ar in the residual gas was determined to be about 50, which is very close to the (N₂/Ar) ratio of the gas dissolved in sulfuric acid or in water.
Therefore the absorption method for the removal of nitric oxide was found not to be recommended, and error may occur during the manipulation. Carbon dioxide in nitrometer was measured by the gravimetric method and was given about 0.15% regardless of the concentration of sulfuric acid used. But no sulfur dioxide gas was recognized in it when 94.5% or 98% sulfuric acid were used.