亜硝酸ナトリウムによるスルファニルアミドの電位差滴定

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書誌事項

タイトル別名
  • Potentiometric titration of sulfanylamide with sodium nitrite.
  • アショウサン ナトリウム ニ ヨル スルファニルアミド ノ デンイサ テキテイ
  • 双金属極電位差滴定法における電極について(第12報)

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説明

Potentiometric titration of sulfanylamide with sodium nitrite was carried out in the solution acidified with hydrochloric acid, by using seven bimetallic electrode couples ; platinum-antimony, platinum-nickel, platinum-palladium, platinum-tungsten, platinum-tantalum, platinum-molybdenum and platinum-silver. The titration curves were constructed and the magnitudes of change in potential at the end point were obtained. The influences of concentration of hydrochloric acid used to acidify the system on them were also investigated.<BR>Platinum-tungsten and platinum-palladium electrode couples showed a titration curve with a peak and the potentials at the end point increased abruptly. On the other hand, the other five electrode couples presented an S-shaped titration curve and the potentials at the end point receded suddenly.<BR>In case of 1N hydrochloric acid solution, the end points for all couples were not clear. The optimum concentration with respect to hydrochloric acid was 6N. The samples containing sulfanylamide in the range of 40 to 170mg per 55ml solution were titrated directly and satisfactorily by this method.

収録刊行物

  • 分析化学

    分析化学 11 (5), 554-558, 1962

    公益社団法人 日本分析化学会

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