Nonideal transport of contaminants in heterogeneous porous media: 10. Impact of co-solutes on sorption by porous media with low organic-carbon contents |
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| Institution: | 1. School of Chemical and Environmental Engineering, China University of Mining &Technology, Beijing 100083, China;2. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;3. School of Environment, Tsinghua University, Beijing 100084, China;4. BGI Engineering Consultants Ltd., Beijing 100038, China;5. School of Environment and Energy, Peking University, Shenzhen 518055, China;1. Institute of Environmental Science & Research Ltd., PO Box 29181, Christchurch 8540, New Zealand;2. Institute of Hydrochemistry, Technische Universität München, Marchioninistr. 17, D-81377 München, Germany;1. Department of Earth and Environmental Sciences, University of Kentucky, Lexington, KY 40506-0053, USA;2. Department of Geology, University of Basra, Basra, Iraq |
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| Abstract: | The impact of co-solutes on sorption of tetrachloroethene (PCE) by two porous media with low organic-carbon contents was examined by conducting batch experiments. The two media (Borden and Eustis) have similar physical properties, but significantly different organic-carbon (OC) contents. Sorption of PCE was nonlinear for both media, and well-described by the Freundlich equation. For the Borden aquifer material (OC = 0.03%), the isotherms measured with a suite of co-solutes present (1,2-dichlorobenzene, bromoform, carbon tetrachloride, and hexachloroethane) were identical to the isotherms measured for PCE alone. These results indicate that there was no measurable impact of the co-solutes on PCE sorption for this system. In contrast to the Borden results, there was a measurable reduction in sorption of PCE by the Eustis soil (OC = 0.38%) in the presence of the co-solutes. The organic-carbon fractions of both media contain hard-carbon components, which have been associated with the manifestation of nonideal sorption phenomena. The disparity in results observed for the two media may relate to relative differences in the magnitude and geochemical nature of these hard-carbon components. |
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