有機微量分析に関する研究 (第1報)

窒素定量法について

抄録

Micro-Dumas method of nitrogen determination was revised to give improved results. In this revised method, the sample is weighed in a platinum boat, the combustion tube of quartz having a side tube is used, and the movable furnace is operated automatically. By these improvements, the burning procedure becomes rapid and simplified. By preventing the adherence of bubbles on the mercury surface in the azotometer, pretreatment of marble and hydrochloric acid, and by the control of the process by open-type mercury pressure gauge, microbubble procedure has been made more accurate and rapid. The present method is especially adapted for use with variety of samples, the error being within ±0.2%. The total time required for analysis is approximately 1hour per sample, in continuous operation.