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Role of Biochar and Fungi on PAH Sorption to Soil Rich in Organic Matter

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Abstract

The use of biochar (BC) has been suggested for remediation of contaminated soils. This study aims to investigate the role of microorganisms in sorption of PAH to BC-amended soils. Fungi, especially the wood and litter-degrading fungi, have shown the ability for humification and to degrade recalcitrant molecules, and are thus suitable model organisms. Haplic Arenosol with high organic matter content was chosen to highlight the importance of soil organic matter (SOM) in PAH sorption, possibly to form non-extractable residue. Basidiomycetous fungi Agrocybe praecox and Phanerochaete velutina grown on pine bark were inoculated in organic matter (OM)-rich Haplic Arenosol and OM-poor sandy loam with either BC or chemically activated BC (ABC) and 14C-labelled pyrene for 60 days. Fungi did not mineralize pyrene, but increased sorption up to 47–56% in BC-amended Haplic Arenosol in comparison with controls (13–25%) without a fungus irrespective of the presence of an adsorbent. In OM-poor sandy loam, only 9–12% of pyrene was sorbed to amended soil in the presence of fungus and adsorbent. The results suggest that BC and fungal amendment increased sorption of pyrene, especially to Haplic Arenosol more than by either BC or fungi alone.

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Acknowledgements

The authors thank Jussi Heinonsalo, Kati Hakala and Kari Steffen for providing the experimental soils, and Kaj-Roger Hurme for providing the guidance in working with labelled compounds. This research was funded by Maj and Tor Nessling Foundation.

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  1. Department of Food and Environmental Sciences, University of Helsinki, P.O. Box 56, Biocenter 1, FI-00014, Helsinki, Finland

    Festus Anasonye & Marja Tuomela

  2. Department of Agricultural Sciences, Plant Production Sciences, University of Helsinki, P.O. Box 27, FI-00014, Helsinki, Finland

    Priit Tammeorg

  3. Laboratory of Analytical Chemistry, Department of Chemistry, University of Helsinki, A.I. Virtasen aukio 1, P.O. Box 55, FI-00014, Helsinki, Finland

    Jevgeni Parshintsev & Marja-Liisa Riekkola

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  1. Festus Anasonye
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Anasonye, F., Tammeorg, P., Parshintsev, J. et al. Role of Biochar and Fungi on PAH Sorption to Soil Rich in Organic Matter. Water Air Soil Pollut 229, 49 (2018). https://doi.org/10.1007/s11270-018-3708-2

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