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1,4-Dioxane cosolvency impacts on trichloroethene dissolution and sorption
Justin Milavec1, Geoffrey R Tick2, Mark L Brusseau3
1Water 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.
Environmental Pollution (Barking, Essex : 1987)
|June 15, 2019
Summary
1,4-dioxane enhances trichloroethene (TCE) solubility and affects its transport in groundwater. This study clarifies how co-disposed contaminants impact groundwater plumes and remediation strategies.
Area of Science:
- Environmental Chemistry
- Hydrogeology
- Contaminant Transport
Background:
- 1,4-dioxane is a persistent groundwater contaminant often co-disposed with chlorinated solvents like trichloroethene (TCE).
- The combined impact of 1,4-dioxane and TCE on contaminant transport in groundwater remains poorly understood.
Purpose of the Study:
- To investigate the aqueous dissolution and sorption behavior of 1,4-dioxane and TCE mixtures.
- To evaluate the cosolvency effects of 1,4-dioxane on TCE solubility and sorption to aquifer sediments.
Main Methods:
- Batch equilibrium experiments were performed with varying compositions of 1,4-dioxane and TCE.
- Solubility and sorption coefficients (Kd and Kf) were measured for both contaminants under different mixture ratios.
Main Results:
- 1,4-dioxane significantly enhanced the aqueous solubility of TCE, acting as a cosolvent.
- TCE sorption (Kd) to aquifer sediments decreased with increasing 1,4-dioxane concentration due to cosolvency effects.
- Both contaminants demonstrated adsorption to aquifer sediments, with TCE Kd influenced by organic matter content.
Conclusions:
- Cosolvency of 1,4-dioxane alters the solubility and sorption of TCE, impacting groundwater plume dynamics.
- Findings advance understanding of mass transfer processes for 1,4-dioxane and TCE in groundwater.
- Results have significant implications for the effective remediation of co-contaminated groundwater sites.
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