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土壤和不和区作为地下水中农药代谢物的长期来源

Simone Hintze¹, Fabien Cochand¹, Gaétan Glauser²

¹Centre for Hydrogeology and Geothermics (CHYN), University of Neuchâtel, Rue Emile-Argand 11, CH-2000 Neuchâtel, Switzerland.

|June 29, 2024

概括

土壤和不和区域作为农药代谢物在地下水中的长期来源,即使在农药应用停止后. 这些残留物可以持续十多年,在母化合物降解后很长时间影响水质.

科学领域:

环境化学环境化学
土壤科学土壤科学
水文地质学水文地质学

背景情况:

农药代谢物经常在地下水中被检测到比原生农药更高的度.
停止农药的应用往往无法减少地下水代谢物水平,因为土壤残留物.
与原始农药残留物相比,土壤中的农药代谢物残留物研究有限.

研究的目的:

调查土壤/不和区作为地下水中农药代谢物的潜在长期来源.
评估化 (CLZ) 代谢物,化 (DPC) 和甲基化 (MDPC) 在土壤和地下水中的持久性和转移.
模拟土壤结合的代谢物对地下水质量的长期影响.

主要方法:

现场研究结合了农业地区的土壤和地下水分析,其中有化的应用历史.
在最后一次CLZ应用后5-10年收集的土壤样本中分析CLZ,DPC和MDPC度.
农药代谢物运输和在土壤和不和区的命运的数值建模,考虑吸附和孔水度.

主要成果:

土壤样本显示DPC (10x) 和MDPC (6x) 的度明显高于CLZ.
发现大多数DPC (63-96%) 和MDPC (74-97%) 在土壤中被吸收,主要与有机碳含量有关.
从农业区向下倾斜的区域观察到较高的DPC和MDPC地下水度,这表明来自土壤/不和区的来源.

结论:

土壤和不和区作为农药代谢物到地下水的持久,长期来源.
在土壤中受有机碳影响的代谢物保留,可以在长时间内持续释放到地下水中.
即使是高度移动的农药代谢物也可能导致长期的地下水污染,需要更新风险评估和管理策略.

关键词:

地下水的地下水.长期动态长期动态代谢物保留代谢物保留杀虫剂的代谢产物杀虫剂的代谢产物土壤残留物土壤残留物

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