A rapid micromethod for the determination of nitrogen in organic compounds, such as pyridine, pyrimidine, purine, thiazole, alkaloids and amino acids, is described.A mixture of thermal decomposed product of silver permanganate and black crystalline form of manganese dioxide is used as oxidizing agent, and during the course of decomposition pure electrolytic oxygen is introduced to the carbon dioxide gas stream.Metallic copper is used as reducing agent.The error of this method is within ±0.2%.Each determination takes 10 to 15 minutes.