1, 4-Dioxane cosolvency impacts on trichloroethene dissolution and sorption. (September 2019)

• Record Type: Journal Article
• Authors: Milavec, Justin; Tick, Geoffrey R.; Brusseau, Mark L.; Carroll, Kenneth C.
• Is Part Of: Environmental pollution. Volume 252(2019):Part A
• Page Start: 777
• Page End: 783
• Publication Date: 2019-09
• Subjects: 1, 4-Dioxane -- TCE -- Groundwater contamination -- NAPL -- Cosolvent -- Sorption; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2019.05.156
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: 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. Graphical abstract: Image 10485 Highlights: Cosolvency impacts of 1, 4-dioxane co-disposal with chlorinated solvent TCE. 1, 4-Dioxane increases the TCE solubility and decreases sorption. Solubility enhancement was predicted using log-linear cosolvency model. Abstract : 1, 4-Dioxane (cosolvent) increased the solubility of TCE and decreases sorption, and log-linear cosolvency model predicted solubility enhancement.