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Targeted Plasma Membrane Delivery of a Hydrophobic Cargo Encapsulated in a Liquid Crystal Nanoparticle Carrier
Published on: February 8, 2017
Dicarboxylic acid transport through hematite-coated sand
1Department of Civil and Environmental Engineering and Geodetic Science, The Ohio State University, Columbus, OH 43210, USA.
Chemosphere
|December 18, 2009
Summary
The transport of organic acids in hematite-coated sand depends on their type and concentration. Phthalic acid exhibited unique adsorption behavior, influencing the subsurface environment dynamics.
Area of Science:
- Environmental Science
- Geochemistry
- Soil Science
Background:
- Low molecular weight organic acids are crucial in subsurface processes.
- Understanding their transport is key to predicting environmental fate.
- Hematite coatings on sand influence acid-adsorption behavior.
Purpose of the Study:
- Investigate the transport of phthalic, maleic, and fumaric acids in hematite-coated sand.
- Analyze behavior in both single and binary organic acid systems.
- Determine the influence of pH on organic acid transport and adsorption.
Main Methods:
- Column experiments using water-saturated, hematite-coated sand.
- Studied transport of three dicarboxylic acids at single ionic strength (0.1M) and two pH values (4.1, 5.3).
- Analyzed breakthrough curves in single and binary acid systems.
Main Results:
- Breakthrough order in single systems: fumaric, maleic, then phthalic acid.
- Phthalic acid showed dual adsorption fronts at pH 5.3 due to pH increase.
- In binary systems, higher affinity acids (phthalic) displaced lower affinity acids (fumaric).
Conclusions:
- Organic acid transport is governed by adsorption affinity and system composition.
- Phthalic acid's behavior suggests a dual-component system (acid and H+).
- Findings advance understanding of organic acid fractionation in subsurface environments.
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