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In the present work the Flory–Huggins model with two electrostatic terms (the Debye–Huckel equation and Pitzer–Debye–Huckel equation) and the osmotic virial model have been used to obtain the activities of polymer, salt and water for the liquid–liquid equilibrium of the aqueous polyvinylpyrrolidone+potassium dihydrogen phosphate/dipotassium hydrogen phosphate buffer at various temperatures (298.15,...
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