Role of cinchona-alkaloids on the formation of ion associates between sulphonephthalein dyestuffs and quaternary ammonium ions.

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  • SAKAI Tadao
    Department of Applied Chemistry,Aichi Institute of Technology,1247,Yachigusa,Yakusa-cho,Toyota-shi,Aichi 470-0392

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Other Title
  • スルホフタレイン染料と第四級アンモニウムイオンとのイオン会合形成に及ぼすシンコナアルカロイド共存の効果
  • スルホフタレイン センリョウ ト ダイ4キュウ アンモニウムイオン ト ノ イオン カイゴウ ケイセイ ニ オヨボス シンコナアルカロイド キョウゾン ノ コウカ

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Abstract

Sulphonephthalein dyestuffs, such as Bromophenol Blue(BPB), Bromochlorophenol Blue(BCPB), Tetrabromophenol Blue(TBPB)and Bromocresol Green(BCG), react with quaternary ammonium salts(R4N+)to form 1:2 blue ion associates.However, its extractability and the linearity of the calibration graph are not good.When cinchona-alkaloids, quinine, quinidine, cinchonine and cinchonidine coexist in the sulphonephthalein dyestuff-R4N+ extraction system, a new ion associate(a ternary ion associate)is formed, and the extractability is enhanced.The dynamic range is enlarged compared with that of the blue dyestuff-R4N+ associate.Ternary ion-associate formation by the addition of a cinchona-alkaloid is useful for the determination of trace amounts of quaternary ammonium salts and cationic surfactants.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 49 (10), 745-752, 2000

    The Japan Society for Analytical Chemistry

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