1,4-Dioxane cosolvency impacts on trichloroethene dissolution and sorption.

Autor: Milavec J; Water Science and Management Program, New Mexico State University, MSC 3Q, USA; Plant & Environmental Science, New Mexico State University, MSC 3Q P.O. Box 30003, Las Cruces, NM, 88003, USA., Tick GR; Department of Geological Sciences, University of Alabama, Tuscaloosa, AL, 35487, USA., Brusseau ML; Soil, Water and Environmental Science Department, University of Arizona, USA; Hydrology and Atmospheric Sciences Department, University of Arizona, Tucson, AZ, 85721, USA., Carroll KC; Water Science and Management Program, New Mexico State University, MSC 3Q, USA; Plant & Environmental Science, New Mexico State University, MSC 3Q P.O. Box 30003, Las Cruces, NM, 88003, USA. Electronic address: kccarr@nmsu.edu.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2019 Sep; Vol. 252 (Pt A), pp. 777-783. Date of Electronic Publication: 2019 May 31.
DOI: 10.1016/j.envpol.2019.05.156
Abstrakt: Solvent stabilizer 1,4-dioxane, an emerging recalcitrant groundwater contaminant, was commonly added to chlorinated solvents such as trichloroethene (TCE), and the impact of co-disposal on contaminant transport processes remains uncertain. A series of batch equilibrium experiments was conducted with variations of 1,4-dioxane and TCE composition to evaluate aqueous dissolution of the two components and their sorption to aquifer sediments. The solubility of TCE increased with increasing amounts of 1,4-dioxane, indicating that 1,4-dioxane acts as a cosolvent causing solubility enhancement of co-contaminants. The solubilization results compared favorably with predictions using the log-linear cosolvency model. Equilibrium sorption coefficients (K d and K f ) were also measured for different 1,4-dioxane and TCE compositions, and the findings indicate that both contaminants adsorb to aquifer sediments and TCE K d values increased with increasing organic matter content. However, the K d for TCE decreased with increases in 1,4-dioxane concentration, which was attributed to cosolvency impacts on TCE solubility. These findings further advance our understanding of the mass-transfer processes controlling groundwater plumes containing 1,4-dioxane, and also have implications for the remediation of 1,4-dioxane contamination.
(Copyright © 2019 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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