Liquid exclusion adsorption chromatography, a new technique for isocratic separation of nonionic surfactants: III. Two-dimensional separation of fatty alcohol ethoxylates

A quantitatively accurate mapping of lower fatty alcohol ethoxylates can be achieved using a combination of liquid chromatography under critical conditions as the first dimension and liquid exclusion–adsorption chromatography as the second dimension. With coupled density and refractive index detection in both dimensions, the contribution of preferential solvation can also be estimated. In most cases, however, the use of refractive index detection alone also yields satisfactory results.