title: Ion-exchange resins in non-aqueous solvents-II Sorption of P-nitroaniline and other weak bases in water-organic solvent mixtures.
abstract: Sorption of p-nitroaniline and several weak organic bases on macro- and microreticular hydrogen-form resins is reported. The solvents used in the study are mixtures of water and fourteen watermiscible organic solvents. The distribution coefficients change from a large value at pure organic solvent to a minimum value at 80% organic solvent-20% water, then increase again except for the basic solvents where no sorption takes place at high organic solvent concentration. It is suggested that in the vicinity of the minimum D a transition in sorption mechanism takes place. A similar behaviour is observed for several other weak organic bases. The sorption of p-nitroaniline in 80% organic solvent-20% water as a function of time is reported. Mesh size and percentage cross-linking are other variables considered.
authors.affiliation: Department of Chemistry, University of Iowa, Iowa City, Iowa 52240, U.S.A.
authors.forename: D J
authors.initials: DJ
authors.lastname: Pietrzyk