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Two‐phase mixed indicator method for the determination of zwitterionic surfactants
Author(s) -
Rosen Milton J.,
Zhao Fulin,
Murphy Dennis S.
Publication year - 1987
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02549309
Subject(s) - chemistry , phase (matter) , chromatography , pulmonary surfactant , ethanol , mixed phase , chemical engineering , organic chemistry , biochemistry , engineering
The two‐phase, mixed indicator method for anionic surfactants has been modified and applied to zwitterionic surfactants. The modifications entail: (i) lowering the pH; (ii) adding 95% ethanol, and (iii) increasing the concentration of mixed indicator solution and adjusting the ratio of the indicators. By adjusting one parameter (the amount of 95% ethanol added), the method is applicable to different types of zwitterionic surfactants. Six different surfactants were examined; three were pure materials synthesized and purified in our laboratory, and the remaining three were commercial materials.