Volumetric Methods and Ion-Pair Spectroscopy

Volumetric methods used for hydrocarbon-type surfactants [1] are applicable to fluorinated surfactants, unless the solubility of the fluorinated surfactant imposes some limitations. Anionic fluorinated surfactants can be titrated potentiometri-cally with benzethonium chloride (Hyamine 1622), using a surfactant-selective [36] or a nitrate-selective electrode (Fig. 9.2). Cationic surfactants can be titrated 

Two-phase titration methods [1] are less convenient and not applicable to a fluorinated surfactant, if a suitable water-immiscible solvent cannot be found for the ion pair formed by the fluorinated surfactant. 

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