ABSTRACT
The retention ratio R, or the value of A, is related to the mass property of the retained solute. With most techniques of classical Field-Flow Fractionation (FFF), it is the size of macro-molecules or particles of the sample under separation, expressed either in molar mass or in effective diameter (e.g., Stokes' diameter), that is this property. The difference between the applications of FFF to analytical purposes on the one hand and to physico-chemical measurements on the other is rather a question of how to utilize the results not a question of the fundamental procedure. This chapter discusses typical important examples of applications of various FFF techniques. Flow FFF was further used to fractionate water-soluble polymers: potassium salts of sulfonated polystyrene standards with a narrow distribution of molar masses and sodium salts of polyacrylic acid.
