アクリジンによるニオブおよびタンタルの分離ならびに定量

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書誌事項

タイトル別名
  • Separation and determination of niobium and tantalum by acridine
  • アクリジン ニ ヨル ニオブ オヨビ タンタル ノ ブンリ ナラビニ テイリョウ
  • アクリジンによる金属の分離ならびに定量法に関する研究(第4報)

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抄録

A solution containing Nb is treated with 25 ml HCl (d 1.18), 25 ml 50% NH4SCN and water to make the concentration of HCl to about 2N. This is treated with 10 ml 5% alcoholic solution of acridine and allowed to stand for 30min. at below 30°C for quantitative precipitation of Nb. This is filtered, washed with a solution composed of 1l HCl (1 : 9) and 100 ml 50% NH4SCN and heated at 900°C for quantitative determination of Nb. Similarly, a solution containing Ta gives quantitative precipitation of Ta. The same treatment of a solution containing Nb and Ta after an addition of 15 ml saturated (NH4)2C2O4 gives quantitative precipitation of Ta but no precipitation of Nb. Therefore, nearly a complete separation of Ta from Nb is possible by one procedure. In case when more complete, separation is necessary, reprecipitation by the following procedure should be applied: The precipitate of Ta by the addition of acridine is dissolved by heating above 60°C with 25 ml HCl (d 1.18), 5 ml 3% H2O2 and 80 ml water, then 15 ml saturated (NH4)2C2O4 are added, cooled to 30°C, 25 ml 50% NH4SCN and 10 ml 5% alcoholic solution of acridine are added and the solution is treated as above for quantitative precipitation of Ta but no Nb. In this method, the presence of Fe3+, Zn2+, Co2+, V (V), Mo(V), Mo(VI), Cr(VI), W (VI) and Cu2+ showed disturbing influence but those of Fe2+, V (IV), Cr3+, Mn2+, Ni2+, Al3+, Bi3+, Ca2+, Mg2+, Pb2+, Sb5+, Sn4+, Ti4+, etc. were without influence.

収録刊行物

  • 分析化学

    分析化学 9 (6), 507-511, 1960

    公益社団法人 日本分析化学会

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