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

A quantitatively accurate mapping of lower fatty alcohol ethoxylates can be achieved using a combination of liquid chromatography under critical condi tions as the first dimension and liquid exclusion-adsorption chromatography as the second dimension. With coupled density and refractive index detecti on 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. (C) 2001 Elsevier Science B.V. All rights reserved.