石灰窒素分析法の研究(第1・2報)

DOI Web Site Web Site

書誌事項

タイトル別名
  • Studies on Analysis of Calcium Cyanamide. (I·II)
  • セッカイ チッソ ブンセキホウ ノ ケンキュウ 1 2

この論文をさがす

抄録

Results of quantitative estimation of dicyandiamide in calcium cyanamide by various methods do not always give agreement and there are considerable variation. Furthermore, these methods require a considerable time and there are many difficulties in their practical application. The present report deals with the studies on the effects of the amount of sample used, concentration of reagents, presence of impurities, and pH at the time of precipitation temperature and tiltrating condition in Harger method or "silver picrate method" with the result that this method is inaccurate in the presence of impurities, e. g. melamine and guanidine; a suitable method to be applicable in such a case is established with higher accuracy and rapidity in comparison with heretofore known methods. A preliminary report on the corrected values of sulubilities is given.<BR>An improved Harger method described in the first report gave accuracy and rapidity. However, the method was not ideal in point of rapidity and further studies revealed that a satisfactory result was obtained by application of the formation of guanylurea nitrate from reaction of nitric acid. The method is to add a certain amount of nitric acid to an extracted solution of calcium cyanamide, heat the mixture in a sealed container for 15 minutes at 100°C, the excess of nitric acid being estimated by titrating it with sodium hydroxide with an aim of estimations the amount of dicyandiamide from the amount of nitric acid consumed for the reaction. The time required for the reaction is 3 hours including the extraction, it does not require special reagents and its accuracy is ±3% of the content.

収録刊行物

  • 分析化学

    分析化学 3 (2), 107-114, 1954

    公益社団法人 日本分析化学会

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ