Liquid exclusion–adsorption chromatography, a new technique for isocratic separation of nonionic surfactants: II. Quantitation in the analysis of fatty alcohol ethoxylates

A new technique of liquid chromatography, which allows baseline separation of fatty alcohol ethoxylates with up to 15–20 ethylene oxide units under isocratic conditions allows an accurate quantitative analysis of single hydrophobic chain surfactants. Using density and refractive index detection, the accurate weight fractions of the individual oligomers are obtained. Moreover, the contribution of preferential solvation can be determined. With refractive index detection alone, good accuracy can also be achieved.