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<p>The photodegradation of emerging contaminants (ECs) in aquatic environments is influenced by multiple interacting factors, including mixture effects, surface water composition, organic matter (OM) content, and temperature. This study examined the photolysis behavior of diclofenac (DCF), 17α-ethynylestradiol (EE2), diuron, ciprofloxacin (CIP), and terbutryn under UV-A irradiation. Results show that mixture interactions inhibit photodegradation due to competitive light absorption, while surface water constituents, such as nitrates and dissolved organic matter (DOM), enhance degradation through reactive species formation. Surface water constituents, such as nitrates and DOM, enhanced degradation, reducing the half-life of EE2 from 46 to 28&#xa0;min and DCF from 187 to 64&#xa0;min, while OM content exhibited a dual role: at low concentrations, it promoted photodegradation, but at higher concentrations, it exerted a photoshielding effect, reducing light availability. Temperature effects were dependent on water composition—higher temperatures (35&#xa0;°C) accelerated photodegradation in distilled water but inhibited it in surface water due to altered indirect photolysis pathways. Notably, terbutryn, exhibited increased degradation at higher temperatures in OM-rich conditions, suggesting temperature-driven desorption from OM surface. These findings highlight the complexity of ECs degradation in natural waters and emphasize the need for site-specific assessments to accurately predict contaminant fate in different aquatic environmental matrices.</p> Graphical Abstract <p></p>

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Assessment of Climate Change Impacts on Photolysis of Emerging Contaminant Coctail in Aquatic Media: The Interactive Influence of Organic Matter and Temperature

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Lama Ramadan,
  • Irem Ozturk-Ufuk,
  • Huseyin Cengiz Yatmaz,
  • Ebubekir Yuksel,
  • Emel Topuz

摘要

The photodegradation of emerging contaminants (ECs) in aquatic environments is influenced by multiple interacting factors, including mixture effects, surface water composition, organic matter (OM) content, and temperature. This study examined the photolysis behavior of diclofenac (DCF), 17α-ethynylestradiol (EE2), diuron, ciprofloxacin (CIP), and terbutryn under UV-A irradiation. Results show that mixture interactions inhibit photodegradation due to competitive light absorption, while surface water constituents, such as nitrates and dissolved organic matter (DOM), enhance degradation through reactive species formation. Surface water constituents, such as nitrates and DOM, enhanced degradation, reducing the half-life of EE2 from 46 to 28 min and DCF from 187 to 64 min, while OM content exhibited a dual role: at low concentrations, it promoted photodegradation, but at higher concentrations, it exerted a photoshielding effect, reducing light availability. Temperature effects were dependent on water composition—higher temperatures (35 °C) accelerated photodegradation in distilled water but inhibited it in surface water due to altered indirect photolysis pathways. Notably, terbutryn, exhibited increased degradation at higher temperatures in OM-rich conditions, suggesting temperature-driven desorption from OM surface. These findings highlight the complexity of ECs degradation in natural waters and emphasize the need for site-specific assessments to accurately predict contaminant fate in different aquatic environmental matrices.

Graphical Abstract