電量滴定法によるアルゴン中不純物の分別定量

概要

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Since the coulometric titration method of a microamount of water after conversion into ammonia with sodium amide can be used for the analysis of carbon dioxide and oxygen, various impurities in commercial argon were fractionally determined by this method. The apparatus included the furnace of copper and copper(II) oxide, Phosphorous pentoxide and cold trap of about-70℃, and these devices were used under various combinations. Carbon dioxide in the samples was determined separately and directly by the non-aqueous microtitration method. Oxygen reacts with sodium amide and produces ammonia. The stoichiometric production ratio between oxygen and ammonia was 3:1 in the range of (10〜100) ppm of oxygen in argon, which was one half of the value shown in literature. Appreciable amounts of impurities could be determined in commercial argon by this method. They were (250〜940)ppm H_20,(20〜36)ppm 0_2,(O.4〜O.8)ppm CH_4, O〜O.5ppm CO_2,(O.2〜O.4)ppm H_2.
1983-03-05