酸素の微量分析 : (第1報)予備実験及び窒素の精製条件

概要

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There are many difficulties in the direct determination of oxygen by the method of UNTERZAUCHER. In this modification, the CO produced by the high temperature-carbon was oxidized with CuO (oxidation-furnace shown in Fig. 1. E) and the CO2 was determined gravimetrically. The temperature of the oxidation furnace was fixed at 235° (Fig. 4). It was found that the application of copper-wire (Fig. 1. B) at 550° oculd not remove all the blank values caused by the nitrogen gas used in this experiment. But when the gas was first oxidized with CuO (Fig. 1. A) at 550° and then reduced with Cu at 550° after removing acidic gases with ascalite, the blank value was diminished considerably (see Fig. 6 and Table 2).
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