Interfacial Tension of Chlorinated Aliphatic DNAPL Mixtures as a Function of Organic Phase Composition

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• 作者：Hyeyoung Sophia Seo and John E. McCray
• 刊名：Environmental Science & Technology
• 出版年：2002
• 出版时间：March 15, 2002
• 年：2002
• 卷：36
• 期：6
• 页码：1292 - 1298
• 全文大小：83K
• 年卷期：v.36,no.6(March 15, 2002)
• ISSN：1520-5851

文摘

This research evaluates the ability of three models topredict the organic liquid-water interfacial tension (IFT)of chlorinated aliphatic hydrocarbon mixtures that are densenonaqueous-phase liquids (DNAPLs). Prediction of theIFT is relevant to quantify processes such as DNAPL trappingin soil pores and kinetic interphase mass transfer. Threemodels are evaluated: the Fu et al. method (FU) [Fu,J.; Buqiang, L.; Zihao, W. Chem. Eng. Sci. 1986, 41 (10), 2673-2679]; a modified version of the Apostoluk and Szymanowskimethod (AS) [Apostoluk, W.; Szymanowski, J. SolventExtr. Ion Exch. 1996, 14 (4), 635-651], and a simple linearideal mixing theory (LIMT). The FU and AS methodsrequire knowledge of NAPL-phase mole fractions andmutual solubilities. The LIMT method requires the pureorganic liquid IFT and DNAPL-phase mole fraction as modelinput. Forty chlorinated DNAPL mixtures were used. Themixtures include two-, three-, and four-component DNAPLmixtures of tetrachloroethylene, trichloroethylene, 1,2-cis-dichloroethylene, 1,2-trans-dichloroethylene, and carbontetrachloride. Measured IFT varies nearly linearly with DNAPL-phase mole fraction for the all the DNAPL mixturesexcept those that include 1,2-DCE. The FU and LIMT modelsgenerally provided acceptable results for all mixtures.The FU model yielded an average relative error in thepredicted IFT of 6.4%, while the LIMT model exhibited anaverage error of 9.3%. The AS method exhibited anaverage error of 16.4%.