Abstract
Nitrogen in nitrocellulose and in nitric acid in a sulfuric acid-nitric acid mixture can be determined rapidly and accurately by an acidimetric titration method. The sample is boiled with 20 g ferrous sulfate acid'fied with 6?8N hydrochloric acid in argon gas, resulting in the formation of nitrogen oxide. The nitrogen oxide gas is washed with sodium hydroxide solution, then oxidized to nitric acid by the use of oxygen and hydrogen peroxide, and titrated with a standard sodium hydroxide solution.
Application of this method to the determination of nitrogen in nitrocellulose causes complete decomposition in a short time and quantitative determination can be made within 30?40 minutes with a standard deviation of error of 0.02%.
The determination of nitric acid in a sulfuric acid-nitric acid mixture can be made accurately without any effect of sulfuric acid.
