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Trace metal mobilization in soil by bacterial polymers
J H Chen1, D R Czajka, L W Lion
1School of Civil and Environmental Engineering, Cornell University, Ithaca, New York 14853, USA.
Environmental Health Perspectives
|February 1, 1995
Summary
Bacterial extracellular polymers can enhance trace metal transport in soils. These natural carriers bind metals, move through soil, and resist degradation, suggesting their use in remediating contaminated sites.
Area of Science:
- Environmental Science
- Soil Science
- Biogeochemistry
Background:
- Trace metal transport in porous media is influenced by ligands.
- Naturally occurring carriers can facilitate pollutant movement.
- Bacterial extracellular polymers (BEPs) are potential carriers.
Purpose of the Study:
- To review the properties of BEPs relevant to trace metal transport.
- To assess the potential of BEPs as agents for facilitated transport of trace metals.
- To evaluate the role of BEPs in soil environments.
Main Methods:
- Literature review on BEP production, composition, and degradation.
- Analysis of processes involved in trace metal transport mediated by BEPs.
- Model calculations for contaminant retardation (e.g., cadmium).
Main Results:
- BEPs exhibit high affinity for binding metal ions.
- BEPs are mobile and dispersed in soil environments.
- BEPs show relative resistance to microbial degradation in soils.
Conclusions:
- BEPs possess properties suitable for facilitated trace metal transport.
- Model calculations support the role of BEPs in enhancing metal mobility.
- BEPs are a promising option for application in contaminated soil remediation.