自動式Micro DUMASの改良

概要

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The use of a new automatic apparatus for the micro determination of nitrogen was proposed. The motion of the moving furnace was not started until it was heated, and was stopped when the sample begun to boil or decompose. Two capillary tubes, m1 and m2, (6_??_7cc/min. and 5_??_6cc/min. resp. air passed when 10cm water pressure was applied) and a manometer containing CaC12 soln. was used to detect the change of the pressure in the combustion tube (Fig. 1 and 2). Reduced Cu was placed in a small quartz tube which was separated from the combustion tube by a three way cock. Thus the oxidation of Cu during, the gas exchange was prevented, while the CuO was reoxidized in the process, and the sample was never exposed to the hot gas as it was in Gysels system (Fig. 2 and 3). The rate of the combustion of the sample at 1030° in CO2 was too slow (Table 1a), insertion of CuO behind the sample gave better results (Table 1b and 2b), but the best results were obtained when the sample in a boat was covered with CuO and burnt at 900° (Table 2c).
社団法人日本農芸化学会の論文