UMR LISAH, Université Montpellier, INRAE, IRD, Institut Agro, 34060, Montpellier, France.
Environ Sci Pollut Res Int. 2023 Aug;30(40):92182-92192. doi: 10.1007/s11356-023-28821-1. Epub 2023 Jul 24.
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.
需要减轻土壤和水中的农药分散，以保护生态系统健康和水体的人为用途。生物炭改良被认为可以通过其高吸附潜力来减少农药的分散。然而，由于农药分析成本较高，不同尺度的评估受到限制。本研究的目的是评估两种荧光示踪剂，尿囊素（UR）和磺基罗丹明 B（SRB），在生物炭改良用于减轻农药分散的情况下用作农药替代物的潜力。因此，我们比较了两种荧光示踪剂以及三种农药，草甘膦、2,4-D 和吡虫啉在土壤中的吸附过程；三种木质生物炭（松树、橡树和山毛榉/山毛榉混合物）；以及代表农业用途的土壤/生物炭混合物。结果表明，受测试的松树、橡树和木质混合物生物炭改良后，土壤对草甘膦的吸附不受影响。相比之下，UR、SRB、2,4-D 和吡虫啉的吸附系数随着这些生物炭改良而显著增加。特别是 SRB 表现出与疏水性杀菌剂吡虫啉相似的吸附行为。这表明 SRB 有希望作为疏水性农药的替代物，用于测试生物炭改良。
