Mitsumasa Ono

Determination of trace moisture in hydrogen chloride gas by Karl Fischer titration

Abstract Moisture of several ppm in hydrogen chloride gas has been accurately determined by a new method using the Karl Fischer reagent, which hitherto had a limitation in accuracy because of a partial reaction with hydrogen chloride when direct titration was employed. The moisture in the sample gas was collected in a cold trap kept at about −80 °C while the hydrogen chloride gas passed through and the frozen moisture was dissolved by pyridine-methanol (1:1) solvent. a KF Reagent of factoe: 0.35 mg H2O/ml. Titration by the Karl Fischer reagent having the equivalency factor of, e.g., 0.5 mg H2O/ml was carried out and the concentration of the moisture was calculated from the sample volume used.

New Karl Fischer volumetric reagent composed of a base.

ピリジンに代わる新しい塩基で,カールフィッシャー容量試薬を調製した.各種塩基で検討した結果,新しい塩基としてアミノピリジン化合物が最適であることを見いだした.この新しい容量試薬はピリジン臭がなく,かつ正確さは従来のピリジン含有のカールフィッシャー容量試薬と同等であった.炭化水素類,アルコール類,有機酸類,エステル類,エーテル類,ケトン類,アミン類,糖類,油類,ポリマーなどの水分定量をこの新しい容量試薬で行ったが,従来のカールフィッシャー容量試薬での分析値と良い一致を示した.