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June 1, 2026Journal of Hydrology0 citationsOpen Access

High-resolution study of pollutant mobility in an acid mine drainage-impacted estuary under changing tidal and river contributions

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LSLaura Sánchez-LópezJRJonatan Romero-MatosCCCarlos R. Cánovas

Key Points

  • The study aims to understand how tidal and river influences affect the mobility of pollutants in an acid mine drainage-impacted estuary.
  • Analyzed pollutant dynamics in the Huelva estuary under various tidal and river flow conditions.
  • Examined changes in metal concentration and mobility during estuarine mixing.
  • Increased river flow leads to higher contaminant fluxes and potential export to the Atlantic Ocean.
  • Fe and Al precipitate during mixing and scavenge Cu and Pb into particulate forms.
  • Zn, Cd, Mn, Co, and Ni remain largely mobile during the mixing process, with As showing variable mobility based on pH levels.

Abstract

• Tidal-fluvial interplay governs mining contaminant dynamics in the Huelva estuary. • High river flow enhances contaminant fluxes and export potential to the Atlantic Ocean. • Fe and Al precipitate during mixing, scavenging Cu and Pb into particles. • Zn, Cd, Mn, Co and Ni remain largely mobile during estuarine mixing. • As is first adsorbed to particles, then desorbs at pH > 6, becoming fully mobile.

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Cite This Study

Sánchez-López et al. (2026) studied this question.

synapsesocial.com/papers/6a1d21ba02fbce9130637af6https://doi.org/10.1016/j.jhydrol.2026.135799
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