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Nutrient-assisted phytoremediation of wood preservative–contaminated technosols with co-planting of Salix interior and Festuca arundinacea

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Abstract

The remediation of wood preservative–contaminated sites is an important issue due to the carcinogenic nature of some contaminants derived from wood preservatives (e.g., Cr+6, arsenate, and pentachlorophenol). This study evaluated the effects of fertilizer application on remediation potential of co-plantings of Salix interior Rowlee. (Salix) and Festuca arundinacea Schreb. (Festuca) in a wood preservative–spiked technosol while considering the potential contaminant and nutrient leaching. Two levels of nitrogen (N) and phosphorus (P) fertilizers, NaNO3 and NaH2PO4 (25 and 75 mg L−1), were applied to achieve three N:P ratios, i.e., 3:1 (75:25), 1:3 (25:75), and 1:1 (25:25), that were compared with a control treatment (0:0 N:P) in a mesocosm experiment. Roots of the plant supplied with 1:1 and 1:3 N:P had more than double arsenic (As) and copper (Cu) amounts (i.e., biomass × concentration) compared to the control ones. Highest As and Cu amounts in shoots were found for Salix stems and Festuca leaves in the 1:3 and 1:1 N:P treatments, respectively. Arsenic and P leaching was high in mesocosms supplied with 1:3 N:P. Contamination and nutrient leaching in the 1:1 N:P treatment did not differ from the control, except for Cu. In conclusion, 1:1 N:P treatment yielded the best results in terms of metal(loid) uptake and contaminant and nutrient leaching. In 1:1 N:P treatment, the maximum values of percent As, Cr, and Cu in Salix and Festuca aboveground were 0.18%, 0.024%, and 1.20% and 0.89%, 0.08%, and 1.78%, respectively.

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Abbreviations

ANOVA:

Analysis of variance

CCA:

Chromated copper arsenate

DMSO:

Dimethyl sulfoxide

DOC:

Dissolved organic carbon

EC:

Electrical conductivity

FC:

Field capacity

PCDD/Fs:

Polychlorinated dibenzo-dioxins/furans

PCP:

Pentachlorophenol

SE:

Standard errors

TOC:

Total organic carbon

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Acknowledgements

The authors would like to thank Patrick Boivin and Benoit St-Georges for technical expertise and assistance in the field. We also thank Stéphane Daigle for assistance in data analysis, Karen Grislis for linguistic revision of the manuscript, and Pierre-Luc Chagnon for accepting to pre-review this manuscript.

Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Funding

This study was supported by the Natural Sciences and Engineering Research Council NSERC/Hydro-Québec Industrial Research Chair in Phytotechnology.

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Contributions

Conceptualization: JB, FC, and SY; methodology: JB, FC, and SY; formal analysis and investigation: SY; writing - original draft preparation: SY; writing - review and editing: JB and FC; funding acquisition: JB; resources: JB; supervision: JB and FC. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Sara Yavari.

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The authors declare no competing interests.

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The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.

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Responsible Editor: Elena Maestri

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Yavari, S., Courchesne, F. & Brisson, J. Nutrient-assisted phytoremediation of wood preservative–contaminated technosols with co-planting of Salix interior and Festuca arundinacea. Environ Sci Pollut Res 28, 58018–58034 (2021). https://doi.org/10.1007/s11356-021-14076-1

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  • DOI: https://doi.org/10.1007/s11356-021-14076-1

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