The effect of salt and temperature on the infinite dilution activity coefficients of volatile organic chemicals in water

被引：27

作者：

Brendel, ML

Sandler, SI ^{[1
]}

机构：

[1] Univ Delaware, Dept Chem Engn, Ctr Mol & Engn Thermodynam, Newark, DE 19716 USA

[2] Univ Karlsruhe, Inst Tech Thermodynam & Kaltetech, Karlsruhe, Germany

来源：

FLUID PHASE EQUILIBRIA | 1999年 / 165卷 / 01期

关键词：

infinite dilution activity coefficients; volatile organics; salt effects; Setschenow constants; temperature effects;

D O I：

10.1016/S0378-3812(99)00267-8

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

We have measured the infinite dilution activity coefficients for five volatile organic compounds (dichloromethane, chloroform, 1,2-dichloroethane, trichloroethylene and benzene) in aqueous salt solutions over the temperature range of 10 degrees C to 40 degrees C, and sodium chloride concentrations from 0 to 2.5 M using headspace gas chromatography. These data were easily fit 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 excess enthalpy and entropy at infinite dilution of the organic chemicals as a function of temperature and salt concentration. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：87 / 97

页数：11

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