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BDE-47 sorption and desorption to soil matrix in single- and binary-solute systems
1School of Environment, Tsinghua University, Beijing 100084, China. xinj08@mails.tsinghua.edu.cn
Chemosphere
|January 17, 2012
Summary
Decabromodiphenyl ether (BDE-209) inhibits the sorption of 2,2
Area of Science:
- Environmental Chemistry
- Soil Science
- Polycyclic Aromatic Hydrocarbons
Background:
- Polybrominated diphenyl ethers (PBDEs) are persistent organic pollutants.
- PBDEs accumulate in soil, posing environmental risks.
- Understanding PBDE sorption is crucial for risk assessment.
Purpose of the Study:
- Investigate the sorption and desorption of BDE-47 and BDE-209 in soil.
- Examine the influence of BDE-209 on BDE-47 sorption.
- Elucidate sorption mechanisms and adsorption sites.
Main Methods:
- Sorption and desorption experiments using three loamy-clay soil samples.
- Single and binary system studies with BDE-47 and BDE-209.
- Analysis of sorption isotherms and desorption hysteresis.
Main Results:
- BDE-209 significantly suppressed BDE-47 sorption, especially at higher concentrations.
- BDE-47 did not compete with BDE-209 for sorption sites.
- Soil properties influenced the nonlinearity of BDE-47 sorption isotherms.
- Desorption hysteresis was observed for both compounds, enhanced by BDE-209 presence.
Conclusions:
- BDE-209's presence alters BDE-47 sorption behavior in soils.
- Hydrophobicity influences competitive sorption dynamics.
- Soil properties and BDE-209 interactions affect sorption mechanisms and hysteresis.
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