Determination of some ampholytic and cationic surfactants by potentiometric titrations based on ion-pair formation

Ampholytic surfactants of the betaine type are titrated directly with sodium tetraphenylborate in acidic medium, in which they become cationic forms. Generally, ampholytic surfactants and cationic surfactants that contain hydrophilic groups can be determined by precipitation with sodium tetraphenylb...

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Bibliographic Details
Published in:Analytica chimica acta 1985, Vol.177, p.219-223
Main Authors: Vytrˇas, K., Kalous, J., Symerský, J.
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Electrochemical methods
Exact sciences and technology
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Summary:Ampholytic surfactants of the betaine type are titrated directly with sodium tetraphenylborate in acidic medium, in which they become cationic forms. Generally, ampholytic surfactants and cationic surfactants that contain hydrophilic groups can be determined by precipitation with sodium tetraphenylborate, the excess of which is back-titrated with thallium(I) nitrate. An aluminium wire electrode coated with a plasticized PVC membrane is used for end-point indication. Characteristic data are given for determinations of nine surfactants and applications to textiles are outlined.
ISSN:0003-2670
1873-4324
DOI:10.1016/S0003-2670(00)82955-4