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<p>Rare earth elements are sedimentary pollutants of increasing health concern, yet the effect of global warming on their bioavailability and toxicity is unknown. To test this, we applied the diffusive gradients in thin films technique to assess the bioavailability of 15 rare earth elements, including lanthanides and yttrium, in sediments at temperatures ranging from 0 to 40&#xa0;°C. We modeled the ecotoxicological risk to aquatic organisms using the species sensitivity distribution–probabilistic risk assessment–inclusion–exclusion principle. Results show that the bioavailability of all rare earth elements decreases by 40% to 70% as temperature increases from 0 to 40&#xa0;°C, indicating reduced mobility and enhanced sediment adsorption. Similarly, the calculated ecotoxicological risk is reduced from 1.75 to 0.08%. This is the first evidence of temperature-driven attenuation of rare earth element risk in sediments, suggesting that global warming should decrease the toxicity of some rare earth elements.</p>

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Rising temperatures decrease rare earth element bioavailability and ecological risk in coastal sediments

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • Yang-Guang Gu,
  • Yanpeng Gao,
  • Richard W. Jordan,
  • Shi-Jun Jiang,
  • Hong-Hui Huang

摘要

Rare earth elements are sedimentary pollutants of increasing health concern, yet the effect of global warming on their bioavailability and toxicity is unknown. To test this, we applied the diffusive gradients in thin films technique to assess the bioavailability of 15 rare earth elements, including lanthanides and yttrium, in sediments at temperatures ranging from 0 to 40 °C. We modeled the ecotoxicological risk to aquatic organisms using the species sensitivity distribution–probabilistic risk assessment–inclusion–exclusion principle. Results show that the bioavailability of all rare earth elements decreases by 40% to 70% as temperature increases from 0 to 40 °C, indicating reduced mobility and enhanced sediment adsorption. Similarly, the calculated ecotoxicological risk is reduced from 1.75 to 0.08%. This is the first evidence of temperature-driven attenuation of rare earth element risk in sediments, suggesting that global warming should decrease the toxicity of some rare earth elements.