Ml. Brendel et Si. Sandler, The effect of salt and temperature on the infinite dilution activity coefficients of volatile organic chemicals in water, FLU PH EQUI, 165(1), 1999, pp. 87-97
We have measured the infinite dilution activity coefficients for five volat
ile organic compounds (dichloromethane, chloroform, 1,2-dichloroethane, tri
chloroethylene and benzene) in aqueous salt solutions over the temperature
range of 10 degrees C to 40 degrees C, and sodium chloride concentrations f
rom 0 to 2.5 M using headspace gas chromatography. These data were easily f
it as a function of salt concentration using the Setschenow expression, and
as a function of temperature. By taking derivatives of the fitted data as
a function of temperature, one obtains estimates of the partial molar exces
s enthalpy and entropy at infinite dilution of the organic chemicals as a f
unction of temperature and salt concentration. (C) 1999 Elsevier Science B.
V. All rights reserved.