Abstract
Purpose
Polychlorinated biphenyls (PCBs) are persistent soil contaminants that resist biodegradation and present serious risks to living organisms. The presence of biochar in soils can lower the availability of PCBs to biota. In this study, the effect of biochar enrichment in soils on bioaccumulation of PCBs was investigated.
Materials and methods
We applied two types of biochar including pine needle biochar (PC) and wheat straw biochar (WC), and an activated carbon (AC) to soil (2 % w/w) and employed two alternative methods to quantified rates of bioaccumulation: a living bioassay (using earthworm, Eisenia fetida, as a model organism) and a triolein-embedded cellulose acetate membrane (TECAM).
Results and discussion
Our results show that the application of biochar or AC greatly reduced the uptake of PCBs (particularly less-chlorinated PCBs) by earthworms (the reduction in total PCBs concentration was up to 40.0 and 49.0 % for PC and WC treatments, while 71.6 % for AC application). We found that the bioaccumulation factors (BAFs) for PCBs in the earthworms in biochar/AC-enriched soils were strongly correlated with O:C ratio of the biochar/AC (R 2 = 0.998, p < 0.05). We observed that BAFs increased at log K OW below 6.3 and decreased at log K OW values greater than 6.3. We demonstrated that the concentration of PCBs in TECAM membranes were positively correlated with the concentration of PCBs earthworms in soil.
Conclusions
TECAM offers an efficient and cost-effective method for predicting the bioavailability of PCBs in field-contaminated soils undergoing sorbent-based remediation.
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Acknowledgments
We especially thank anonymous reviewers for their constructive comments that have greatly improved the manuscript. This work was supported by grants from the National Natural Science Foundation of China (No. 21307141, No. 41401336), the National Basic Research and Development Program (No. 2013CB934303), and the Natural Science Foundation of Jiangsu Province of China (BK20130105). We are greatly grateful to Professor Zubin Xie of Institute of Soil Science, Chinese Academy of Sciences, and Professor Zijian Wang of Research Center for Eco-Enviromental Sciences, Chinese Academy of Sciences, for providing us with TECAM.
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Wang, Y., Wang, L., Wang, YJ. et al. Measuring the bioavailability of polychlorinated biphenyls to earthworms in soil enriched with biochar or activated carbon using triolein-embedded cellulose acetate membrane. J Soils Sediments 16, 527–536 (2016). https://doi.org/10.1007/s11368-015-1245-9
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DOI: https://doi.org/10.1007/s11368-015-1245-9