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Extraction of Thermodynamic Data from Ternary Diffusion Coefficients. Use of Precision Diffusion Measurements for Aqueous
 

Summary: Extraction of Thermodynamic Data from Ternary Diffusion
Coefficients. Use of Precision Diffusion Measurements for Aqueous
Lysozyme Chloride-NaCl at 25 C To Determine the Change of
Lysozyme Chloride Chemical Potential with Increasing NaCl
Concentration Well into the Supersaturated Region
Onofrio Annunziata, Luigi Paduano,, Arne J. Pearlstein,| Donald G. Miller,, and
John G. Albright*,
Contribution from the Department of Chemistry, Texas Christian UniVersity, Fort Worth, Texas 76129,
Geosciences and EnVironmental Technologies, Lawrence LiVermore National Laboratory, P.O. Box 808,
LiVermore, California 94551, Department of Mechanical and Industrial Engineering, UniVersity of Illinois
at Urbana-Champaign, 1206 West Green Street, Urbana, Illinois 61801, and Dipartimento di Chimica,
UniVersita` di Napoli, Via Mezzocannone 4, 80134 Naples, Italy
ReceiVed NoVember 1, 1999
Abstract: For ternary systems, we present a method for using measured values of the four ternary diffusion
coefficients and the Onsager reciprocal relations to extract derivatives of solute chemical potentials with respect
to solute molar concentrations. The method is applicable to systems in which the molar concentration of one
solute is very small compared to that of the other, and also small enough that an inverse concentration dependence
dominates certain activity coefficient derivatives. These conditions apply to a large number of aqueous systems
involving macromolecules of biological interest. Unlike other techniques, the present method can be used to
study undersaturated and supersaturated solutions. The approach is illustrated for the lysozyme chloride-

  

Source: Annunziata, Onofrio - Department of Chemistry, Texas Christian University

 

Collections: Chemistry