Abstract
The authors have contrived an improved method for the Pregl's micro nitrogen determinati-on (micro-Dumas). This method has been used for the analysis of a number of organic compounds and has given satisfactory results for about ten years in our laboratory.
The plan and elevation of our apparatus are shown in the figure. The main improved points are as follows:
(1) The special azotometer (Az2) was newly designed in order to examine the remaining air easily.
(2) A copper boat was contrived for combusting the substance.
(3) In the combustion tube, copper-oxid layer was increased than Gysel's and reduced-copper gauzes were used in two layers.
It takes about 50_??_55 minutes for one analysis, and the error is within ±0.2% as the table shows.
