THE EFFECT OF TEMPERATURE ON ION-EXCHANGE EQUILIBRIA. IV. THE COMPARISON OF ENTHALPY CHANGES CALCULATED FROM EQUILIBRIUM MEASUREMENTS AND CALORIMETRICALLY MEASURED VALUES^1,2

Ion Exchange of Bovine Serum Albumin at a Natural Organic Anion Exchanger: Thermodynamics and Energetics

“…coefficients. K a is determined for different values of N RP , C P , and C Cl 0 Ion-exchange processes are reversible in the sense that and then ln K can be calculated by graphical integration of changes in solution conditions cause desorption (a feature ln K a vs N RP plots (26). The solution activity coefficients used in industrial processes).…”

Separation of Amino Acids at a Synthetic Ion Exchange Resin: Thermodynamics and Energetics

“…The relative affinity coefficient K a of the two ions for the resin is defined as (Reichenberg and McCauley, 1955) While K is a true thermodynamic constant, K a varies with the composition of the resin; it is a function of N RAAH , the fractional amount of amino acid on the resin. Combining eqs 4 and 5, It can then be shown that (Davidson and Argensinger, 1953) This last relationship allows the calculation of ln K and hence ∆G°from experimentally measurable quantities: ln K is calculated from the integration of ln K a vs N RAAH plots (Bonner and Overton, 1961). The presence of the solution activity coefficient (γ AA ) does not necessarily complicate matters since if the equilibrium measurements are performed in dilute solutions (e0.1 M) the activity coefficients are approximately equal to unity (Lilley 1985).…”

“…Calorimeters enable the measurement of enthalpy changes in physical and chemical processes. Calori-metric investigations of ion exchange have been carried out previously (Bonner and Overton, 1961;Boyd et al, 1964), but only the exchange of inorganic ions was considered. Calorimetric studies of the adsorption of proteins at ion exchange materials has been carried out (Bowen and Hughes, 1993).…”

Thermodynamics of interphase equilibrium in system ion exchanger-solution of low molecular weight electrolyte

“…Different compounds modeling AR and BR components have been used namely: low molecular weight electrolytes [11][12][13][14][15][16]; low molecular weight organic electrolytes(monomers) or their mixtures [17][18][19]; slightly cross linked organic polyelectrolytes of the chemical nature identical to that of ion exchange resin under study [20][21][22][23].…”

“…Experimental equilibrium constants of ion exchange for AV-17 · 8-HCl-HNO 3 -H 2 O system constants(13). These constants were obtained from sorption isotherms for HCl b HNO3 .…”