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| Effect of aging on extractability and bioavailability of PCB138 in soils |
| Received:November 03, 2015 |
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| KeyWord:PCBs;bioavailability;extractability;earthworms |
| Author Name | Affiliation | E-mail | | FAN Xiao-huan | School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | | SHAN Zhen-hua | School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | | YANG Teng-fei | School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | | YAN Jing-na | School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | | REN Yuan | School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China | ceyren@scut.edu.cn |
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| Abstract: |
| Once entering soil, polychlorinated biphenyls(PCBs) are adsorbed by or bonded with soil components, which may reduce their movements. Therefore, aging time would affect extractability and bioavailability of PCBs in the soil. A 90 day aging study was conducted to estimate the extraction efficiencies of PCB138 by four extracting agents and to access Eisenia fetida's responses. Results showed that the extraction efficiencies were in order of ultra sonic≈soxhlet>n-butanol>pure water. The extraction rates of PCB138 over time were decreased from 87%~93%, 85%~90%, and 50%~60% to 70%~76%, 65%~73%, and 25%~45%, for soxhlet, ultra sonic, and n-butanol, respectively. The total extraction amount of PCB138 became stable after 30~45 days. However, the PCB138 amount extracted by pure water was small. The amount of PCB138 accumulation in E. fetida increased with increasing of contacting time and reached the maximum in 30 days. The fat content in E. fetida increased during the first 30 days but decreased a little during 30~60 days. These results demonstrated that the extractability of PCB138 by n-butanol, US, and Soxhlet extraction decreases over aging and the bioavailability to earthworms also decreases. |
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