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Chromatographic analysis of the acidity-salinity transport system
Colin J McNeece1, Johannes Lützenkirchen2, Marc A Hesse3
1The University of Texas at Austin, Department of Geological Sciences, 2305 Speedway Stop C1160, Austin, TX 78712-1692, United States of America.
Journal of Contaminant Hydrology
|August 28, 2018
Summary
Understanding acidity and salinity effects on solute transport in porous media is key. Including amphoteric quartz surface behavior improves models of this coupling, especially under acidic conditions.
Area of Science:
- Geochemistry
- Environmental Science
- Hydrogeology
Background:
- Solute transport in porous media is influenced by acidity and salinity.
- Existing models struggle to capture the coupled effects of acidity and salinity in quartz sand under acidic conditions.
Purpose of the Study:
- To evaluate surface complexation models (SCMs) for their ability to represent acidity-salinity coupling in porous media.
- To analyze reactive transport equations and compare SCMs using a chromatographic approach.
Main Methods:
- Analysis of reactive transport equations in the limit of no diffusion.
- Chromatographic analysis to create phase plane representations of solutions.
- Comparison of different surface complexation models.
Main Results:
- Including amphoteric behavior of the quartz surface enhances the predicted coupling between acidity and salinity.
- A secondary proton sorption reaction strengthens the acidity-salinity coupling under acidic conditions.
- Positively charged surface sites are crucial for reactive transport, even when the overall surface charge is negative.
Conclusions:
- Amphoteric surface complexation models provide a more accurate representation of coupled acidity-salinity transport in quartz sand.
- The role of positively charged sites on quartz surfaces is significant in governing solute transport dynamics.
- Improved modeling is essential for applications like seawater intrusion and nuclear waste storage.
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