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Irreversible sorption of pentachlorophenol to sediments: experimental observations
Ying-Xu Chen1, Hua-Lin Chen, Yun-Tai Xu
1Department of Environmental Engineering, Huajiachi Campus, Zhejiang University, Hangzhou 310029, PR China. yxchen@zju.edu.cn
Environment International
|December 11, 2003
Summary
Pentachlorophenol (PCP) partitioning in sediments is linear with organic carbon. Sorption-desorption hysteresis, driven by lipids, leads to slower PCP release and lower than expected ecological toxicity.
Area of Science:
- Environmental Chemistry
- Soil Science
- Toxicology
Background:
- Pentachlorophenol (PCP) is a persistent organic pollutant.
- Understanding PCP's environmental fate is crucial for risk assessment.
Purpose of the Study:
- To investigate the partitioning behavior of PCP in diverse sediments.
- To analyze sorption-desorption hysteresis and its impact on PCP release.
Main Methods:
- Equilibrium sorption experiments.
- Multiple cycles of sorption and desorption experiments.
- Correlation analysis between hysteresis indices and sediment lipid content.
Main Results:
- PCP sorption isotherms were linear and correlated with sediment organic carbon content (logKoc = 2.83 ± 1.48).
- Significant sorption-desorption hysteresis was observed, with hysteresis indices (HI) ranging from 0.72 to 11.82.
- Sediment lipid content was identified as the primary driver of hysteresis, increasing with higher lipid percentages.
Conclusions:
- Lipid entrapment causes irreversible PCP sorption and slow desorption, leading to hysteresis.
- Sorption-desorption hysteresis reduces the anticipated ecological toxicity of PCP.
- Sediment lipid content is a key factor in predicting PCP's environmental behavior and bioavailability.