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  1. No Access

    Article

    Formation of ternary ion associates using diprotic acid dyes and its application to determination of cationic surfactants

    A sensitive and selective method is described for the determination of cationic surfactants, such as benzethonium, benzalkonium, cetylpyridinium and trimethylstearylammonium, based on the formation and extract...

    Tadao Sakai, Noriko Ohno, Takeshi Kamoto, Hideto Sasaki in Microchimica Acta (1992)

  2. No Access

    Article

    Extraction-Spectrophotometric Determination of Berberine in Crude Drugs by the Formation of a New Ion Associate

    A sensitive and selective method based on the formation of ternary complexes of berberine, quinidine and a divalent anion of dibasic acid dyes (A2−) such as Bromophenol Blue, Bromochlorophenol Blue and Bromocreso...

    Tadao Sakai, Noriko Ohno, Hideto Sasaki, Teruyuki Hyuga in Analytical Sciences (1991)