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A Critical Look at Colloid Generation, Stability, and Transport in Redox-Dynamic Environments: Challenges and
Eleanor Spielman-Sun1, Kristin Boye1, Dipankar Dwivedi2
1Environmental Geochemistry Group at SLAC, Stanford Synchrotron Radiation Lightsource (SSRL), SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States.
ACS Earth & Space Chemistry
|April 24, 2024
Summary
Colloid generation, stability, and transport are crucial in environmental systems. Understanding colloids in redox-dynamic environments requires better definitions and more data for accurate modeling of their fate and transport.
Area of Science:
- Environmental Science
- Geochemistry
- Colloid Science
Background:
- Colloid generation, stability, and transport significantly impact nutrient and contaminant fate in environmental systems.
- Redox-dynamic environments present unique challenges for understanding colloidal behavior.
- Current knowledge gaps hinder accurate prediction of colloid behavior and transport.
Purpose of the Study:
- Critically review literature on colloids in redox-dynamic environments.
- Summarize mechanisms of colloid generation and chemical controls.
- Identify research gaps and propose future directions.
Main Methods:
- Literature review of colloid science in redox-dynamic systems.
- Analysis of mechanisms controlling colloid generation and behavior.
- Identification of critical gaps in definition and modeling.
Main Results:
- Colloids play a critical role in element budgets within redox-dynamic systems.
- Existing definitions and modeling infrastructure are insufficient.
- More empirical data are needed for model parametrization and validation.
Conclusions:
- A functional definition of colloids beyond size is proposed.
- Colloids must be integrated into environmental field and lab experiments and reactive transport models.
- A methodological toolbox is suggested for studying redox dynamics' impact on colloids.
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