Determination of soap in anionic surfactant mixtures and amine and quaternary ammonium salts in cationic surfactant mixtures by using an automated photometric titrator.

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Other Title
  • 自動光度滴定装置を用いた陰イオン界面活性剤混合物中のセッケンの定量及び陽イオン界面活性剤混合物中のアミン塩と四級アンモニウム塩の定量
  • ジドウ コウド テキテイ ソウチ オ モチイタ インイオン カイメン カッセイ
  • Automatic photometric titration of surfactants based on two-phase titration; IV
  • 分相滴定法に基づく界面活性剤の自動光度滴定(第4報)

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Abstract

The determination of soap in anionic surfactant mixtures and amine and quaternary ammonium salts in cationic surfactant mixtures was carried out by using an automated photometric titrator equipped with porous PTFE (Teflon) membrane separator (previous publications) based on two-phase titration. In the case of soap in anionic surfactant mixtures, it is necessary to determine surfactant mixtures under both acidic and alkaline conditions, and the difference between the two determinations indicates the content of soap. However, the analytical values of some anionic surfactants (sodium alkanesulfonate and α-olefinesulfonate) under acidic and alkaline conditions by the previously proposed method were found not to be identical. The difference was considered to be caused by the presence of polysulfonate. Therefore, 7% of 1-hexanol was added to chloroform to improve the recovery of polysulfonate. Under these conditions, the determination of soap in anionic surfactant mixtures was successfully carried out. Furthermore, sulfate-type anionic surfactants in anionic surfactant mixtures were determined by the acid hydrolysis method. By the same way as anionic surfactants, the determination of cationic surfactant mixtures (amine and quaternary ammonium salts) could be also effected by using Disulphine Blue as an indicator, which could be used under both acidic and alkaline conditions.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 37 (3), 137-141, 1988

    The Japan Society for Analytical Chemistry

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