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absorbed absorption tube Acta Akad ammonia Anal anhydroiodic acid Anhydrone apparatus argon barium cyanate blank boat Calc calcium hydride capsule carbon black carbon catalyst carbon dioxide carbon monoxide carried carrier gas catalyst Chem chloride chromatography combustion tube compounds containing copper oxide cyanate cyanic acid determination of oxygen determination of selenium developed direct determination E. A. Bondarevskaya electric furnace equilibrium experimental flask fluorine formed gravimetric ground joint halogen heated helium hydrolysis ibid ignited iodine Khim LITERATURE CITED M. O. Korshun magnesium nitride metal method Meulen micro Mikrochim mixture ml per minute Moscow N. E. Gel'man Nauk SSSR nickel nickel catalyst nitrogen nitrogen flow rate obtained Oita organic compounds oxygen determination oxygen in organic platinum pyrolysis quantitative quartz quartz tube reaction tube reagent reduced rinsed selenious acid selenium dioxide solution stopcock stream substances sulfur Table temperature thermal tion titration tube filling Unterzaucher Zavodskaya Zavodskaya Lab Zhur