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Potential of fluorescent tracers to appraise biochar amendment strategies for pesticide mitigation — insights from comparative sorption

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Abstract

Mitigation of pesticide dispersion in soil and water is required to protect ecosystem health and the anthropic uses of water bodies. Biochar amendments have been suggested to reduce pesticide dispersion due to their high sorption potentials. Nevertheless, appraisals at different scales have been limited by the costs of pesticide analyses. The aim of this study was to evaluate the potential of two fluorescent tracers, uranine (UR) and sulforhodamine B (SRB), for use as pesticide proxies in the context of biochar amendments used for mitigation purposes. Therefore, we compared the sorption processes of both fluorescent tracers and those of three pesticides, glyphosate, 2,4-D, and difenoconazole for soils; three wood biochars (pine, oak, and beech/charm blend); and soil/biochar mixtures representing agricultural usages. The results showed that the sorption of glyphosate by soil was unaffected by amendment with the tested pine, oak, and wood blend biochars. In contrast, the sorption coefficients of UR, SRB, 2,4-D, and difenoconazole were significantly increased with these biochar amendments. SRB, in particular, exhibited sorption behavior similar to that of the hydrophobic fungicide difenoconazole. This indicates promise for the use of SRB as a proxy for hydrophobic pesticides, in testing biochar amendments.

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

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Acknowledgements

We want to thank Clara GARYGA, Carmelo JEAN-LOUIS, and Florinne LACAZE who contributed to data collection as part of their MSc studies. We also want to thank the Carbonex company for providing the biochars and funding for the experiments.

Funding

The study was funded by the Carbonex Company in the framework of a research and development project.

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Seynabou Sene, Jeanne Dollinger, Manon Lagacherie, Claude Hammecker, Anatja Samouelian, and Sandrine Negro contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Seynabou Sene, Jeanne Dollinger, Manon Lagacherie, and Sandrine Negro. The first draft of the manuscript was written by Seynabou Sene and Jeanne Dollinger, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Jeanne Dollinger.

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Responsible Editor: Zhihong Xu

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Sene, S., Dollinger, J., Hammecker, C. et al. Potential of fluorescent tracers to appraise biochar amendment strategies for pesticide mitigation — insights from comparative sorption. Environ Sci Pollut Res 30, 92182–92192 (2023). https://doi.org/10.1007/s11356-023-28821-1

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  • DOI: https://doi.org/10.1007/s11356-023-28821-1

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