Abstract
Three new analytical methods for surfactants have been developed and evaluated, and the stoichiometry in cationic titration of a dianionic surfactant has been determined. The three methods include: (a) a rapid method for pyrolytic cleavage of hydrophobic groups from surfactants to hydrocarbons, which can be used for quantitative identification of the hydrophobic groups; (b) a molecular weight method for alkylphenoxy and alkoxy polyethoxylates based on sulfation followed by cationic titration; and (c) a microcationic titration method designed for low levels (1–10 microequivalents) of anionic surfactants, which possesses certain advantages over conventional methods. Previously stoichiometry in cationic titration has been reported only for monoanionic surfactants. In a study of a dianionic surfactant,n-octadecylbutane 1,4-disulfate, each sulfate group was found to react in a 1:1 equivalent ratio with a cationic titrant.
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References
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Lew, H.Y. Some new developments in surfactant analysis. J Am Oil Chem Soc 49, 665–670 (1972). https://doi.org/10.1007/BF02609384
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DOI: https://doi.org/10.1007/BF02609384