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<p>Although sediment quality in the Seine River has improved since the 1970s, flood events still trigger significant pollution. Sediment deposits collected at ten sites after a 2024 pre-Olympic flood revealed contrasting trends: drugs increased downstream, whereas pesticides decreased. Among metals, lead (Pb) showed the strongest enrichment (up to factor 18 downstream), possibly linked to ongoing urban sources such as the Notre-Dame fire. These findings indicate that, beyond microbial indicators, the chemical status of the Seine remains vulnerable to episodic contamination and warrants sustained monitoring to maintain public confidence.</p>

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Physico-Chemical Properties and Contamination of Flood Sediment Deposits Collected Along the Seine River in Paris During the March 2024 Flood Before Paris Olympics

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Olivier Evrard,
  • Yangjunjie Xu-Yang,
  • Thomas Thiebault,
  • Anthony Foucher,
  • Rémi Bizeul,
  • Camille Asselin,
  • François Baudin,
  • Delphine Thomas,
  • Sophie Ayrault

摘要

Although sediment quality in the Seine River has improved since the 1970s, flood events still trigger significant pollution. Sediment deposits collected at ten sites after a 2024 pre-Olympic flood revealed contrasting trends: drugs increased downstream, whereas pesticides decreased. Among metals, lead (Pb) showed the strongest enrichment (up to factor 18 downstream), possibly linked to ongoing urban sources such as the Notre-Dame fire. These findings indicate that, beyond microbial indicators, the chemical status of the Seine remains vulnerable to episodic contamination and warrants sustained monitoring to maintain public confidence.