NOVEL INDICATOR SYSTEM FOR THE PHOTOMETRIC TITRATION OF IONIC SURFACTANTS IN AN AQUEOUS-MEDIUM - DETERMINATION OF ANIONIC SURFACTANTS WITH DISTEARYLDIMETHYLAMMONIUM CHLORIDE AS TITRANT AND TETRABROMOPHENOLPHTHALEIN ETHYL-ESTER AS INDICATOR

被引：13

作者：

MOTOMIZU, S ^{[1
]}

OSHIMA, M ^{[1
]}

GAO, Y ^{[1
]}

ISHIHARA, S ^{[1
]}

UEMURA, K ^{[1
]}

机构：

[1] KYOTO ELECTR,MINAMI KU,KYOTO 601,JAPAN

来源：

ANALYST | 1992年 / 117卷 / 11期

关键词：

PHOTOMETRIC TITRATION; ANIONIC SURFACTANT; AQUEOUS MEDIUM; TETRABROMOPHENOLPHTHALEIN ETHYL ESTER; DISTEARYLDIMETHYLAMMONIUM SALT;

D O I：

10.1039/an9921701775

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A photometric titration method for anionic surfactants with tetrabromophenolphthalein ethyl ester (TBPE) as indicator was examined. In the presence of a non-ionic surfactant (Triton X-100), TBPE was dissolved in an acidic aqueous medium giving a yellow colour in the acidic form (TBPE.H). When a bulky cation (Q+) was added, TBPE.H reacted with Q+ to form an ion associate (Q+.TBPE-), and the colour changed from yellow to blue. Distearyldimethylammonium ion was the preferred titrant. The titrant was added to a solution of anionic surfactant at pH 3.2, and absorbance changes were monitored with a fibre-optic sensor with a 640 nm interference filter. Anionic surfactants at concentrations from 5 x 10(-6) to 2 x 10(-4) mol dm-3 could be determined, and the standard deviations and the relative standard deviations for ten replicate titrations of 25 cm3 of 2 x 10(-4) mol dm-3 of Various anionic surfactants were 0.03-0.15 cm3 and 0.30-1.65%, respectively.

引用

页码：1775 / 1780

页数：6

共 22 条

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