The method of microdetermination of nitrogen in organic compounds described in a previous paper is further simplified by eliminating the permanent oxidizing filling. Heterocyclic compounds, aliphatic compounds with relatively long chain and ordinary fluorine-containing compounds have been analyzed with good results. The method can therefore be used for routine analysis. When the length of the capsule containing the sample is increased so that more temporary oxidizing filling can be used and the time for the combustion of the sample is lengthened, satisfactory results can also be obtained on highly fluorinated and perfluoro compounds, and compounds with condensed rings and angular methyl groups.