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SimpleBox 4.0: Improving the model while keeping it simple….

Anne Hollander1, Marian Schoorl2, Dik van de Meent3

  • 1National Institute for Public Health and the Environment, Department of Sustainability, Environment and Health, PO Box 1, 3700 BA, Bilthoven, The Netherlands.

Chemosphere
|January 24, 2016
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Summary

SimpleBox 4.0, a new environmental fate model, enhances chemical behavior predictions with updated ocean and soil compartments. This revised model simplifies complexity, improving user-friendliness and environmental modeling accuracy.

Keywords:
Chemical exposure modelingEnvironmental fateMultimedia mass balance modelSimplebox 4.0

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Area of Science:

  • Environmental Science
  • Environmental Chemistry
  • Computational Modeling

Background:

  • Multimedia fate models are crucial for predicting chemical behavior in the environment.
  • SimpleBox, a widely used model, has undergone several updates since its initial release in 1986.
  • Experience with SimpleBox 3.0 and recent scientific advancements led to the development of SimpleBox 4.0.

Purpose of the Study:

  • To introduce and describe the new version of the SimpleBox multimedia fate model, SimpleBox 4.0.
  • To explore the impact of major model changes in SimpleBox 4.0 on predicted chemical concentrations.
  • To assess the effects of revised compartments and parameters on environmental fate modeling.

Main Methods:

  • Implemented eight major changes in SimpleBox 4.0, including new ocean and lake compartments and depth-dependent soil concentrations.
  • Removed local scale and vegetation compartments to enhance model simplicity and user-friendliness.
  • Analyzed the effects of these changes on predicted steady-state concentrations for various chemical groups (neutral organics, acids, bases, metals) under a standard emission scenario.

Main Results:

  • The largest discrepancies between SimpleBox 4.0 and previous versions were attributed to the new layered ocean compartments.
  • Adjustments to partitioning behavior for organic acids and bases, and enthalpy of vaporization values, influenced predictions.
  • Removal of vegetation and local scale compartments simplified the model without compromising essential functionality.

Conclusions:

  • SimpleBox 4.0 represents a significant advancement in multimedia environmental fate modeling.
  • The updated model provides more accurate predictions, particularly due to enhanced ocean compartment representation.
  • The simplified structure of SimpleBox 4.0 improves usability for environmental risk assessment and chemical behavior studies.