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July 4, 2026Journal of Contaminant HydrologyOpen Access

The unsaturated zone of agroecosystems as a delayed source of legacy herbicides to groundwater: A long-term reactive transport modeling

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Authors

GCGabrielle ChedinGIGwenaël ImfeldSPSylvain Payraudeau

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Overview

This Randomized trial evaluates groundwater contamination by legacy herbicides in agroecosystems, suggesting long-term risks persist despite bans.

Key Points

  • The central aim is to understand the long-term dynamics of legacy herbicides in agroecosystems and their impact on groundwater.
  • Developed a one-dimensional reactive transport model to assess multi-decadal dynamics of atrazine and desethylatrazine.
  • Integrated compound properties, historical application records, and hydroclimatic data.
  • Applied the model to seven wellhead protection areas in the Alsace aquifer, France.
  • 99% of applied atrazine mass biodegraded, yet over 99% remains as aged non-extractable residues.
  • Delayed remobilization of residues leads to detectable groundwater contamination for nearly six decades post-ban.
  • Desethylatrazine is more mobile and persists longer than atrazine, dominating long-term groundwater contamination signals.

Cite This Study

Chedin et al. (2026) studied this question.

synapsesocial.com/papers/6a48a29489561a0c2d78d261https://doi.org/10.1016/j.jconhyd.2026.105047
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