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Recommended updates to the USEPA Framework for Metals Risk Assessment: Aquatic ecosystems.

William J Adams1, Emily R Garman2

  • 1Red Cap Consulting, Lake Point, Utah, USA.

Integrated Environmental Assessment and Management
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Advances in metals risk assessment include new bioavailability models for aquatic ecosystems and improved understanding of metal fate in sediments. These tools enhance environmental and human health risk assessments for metals.

Keywords:
BiovailabilityMetal modelsMetals frameworkRapid lossSediment

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Area of Science:

  • Environmental Chemistry
  • Ecotoxicology
  • Risk Assessment

Background:

  • The U.S. Environmental Protection Agency (USEPA) released its "Framework for Metals Risk Assessment" in 2007.
  • This framework guides risk assessors and regulators in evaluating human health and environmental risks associated with metals.
  • Significant scientific progress has been made since the framework's inception.

Purpose of the Study:

  • To review and highlight key scientific advancements in metals risk assessment.
  • To focus on developments in bioavailability, environmental fate, and sediment risk assessment of metals.
  • To showcase the expanded toolkit available for environmental risk assessors.

Main Methods:

  • Development of advanced bioavailability models (e.g., Biotic Ligand Model) for aquatic ecosystems.
  • Evolution of transport and toxicity models (e.g., Unit World Model) for metal fate.
  • Advancements in sediment spiking methods and emerging sediment bioavailability models.

Main Results:

  • Biotic ligand models and multimetal versions are available for common metals, aiding water quality criteria development.
  • Improved understanding of metal transformation, resolubilization, and redistribution in sediments.
  • Emerging sediment bioavailability models and biodynamic models for estimating metal transport to organisms.

Conclusions:

  • Scientific understanding and modeling tools for metals risk assessment have significantly advanced.
  • New models enhance the ability to predict metal toxicity and exposure in aquatic and sediment environments.
  • These developments provide a more robust framework for environmental and human health protection from metals.