Chemical-Specific Representation of Air-Soil Exchange and Soil Penetration in Regional Multimedia Models

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In multimedia mass-balance models, the soil compartment is an important sink as well as a conduit for transfers to vegetation and shallow groundwater. Here a novel approach for constructing soil transport algorithms for multimedia fate models is developed and evaluated. The resulting algorithms account for diffusion in gas and liquid components; advection in gas, liquid, or solid phases; and multiple transformation processes. They also provide an explicit quantification of the characteristic soil penetration depth. We construct a compartment model using three and four soil layers to replicate with high reliability the flux and mass distribution obtained from the exact analytical ... continued below

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36 pages

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McKone, T.E. & Bennett, D.H. August 1, 2002.

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In multimedia mass-balance models, the soil compartment is an important sink as well as a conduit for transfers to vegetation and shallow groundwater. Here a novel approach for constructing soil transport algorithms for multimedia fate models is developed and evaluated. The resulting algorithms account for diffusion in gas and liquid components; advection in gas, liquid, or solid phases; and multiple transformation processes. They also provide an explicit quantification of the characteristic soil penetration depth. We construct a compartment model using three and four soil layers to replicate with high reliability the flux and mass distribution obtained from the exact analytical solution describing the transient dispersion, advection, and transformation of chemicals in soil with fixed properties and boundary conditions. Unlike the analytical solution, which requires fixed boundary conditions, the soil compartment algorithms can be dynamically linked to other compartments (air, vegetation, ground water, surface water) in multimedia fate models. We demonstrate and evaluate the performance of the algorithms in a model with applications to benzene, benzo(a)pyrene, MTBE, TCDD, and tritium.

Physical Description

36 pages

Notes

OSTI as DE00834477

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  • Journal Name: Environmental Science and Technology; Journal Volume: 37; Journal Issue: 14; Other Information: Submitted to Environmental Science and Technology, Volume 37, No.14; Journal Publication Date: 07/15/2003

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  • Report No.: LBNL--46693
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 834477
  • Archival Resource Key: ark:/67531/metadc781697

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  • August 1, 2002

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • April 4, 2016, 12:25 p.m.

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McKone, T.E. & Bennett, D.H. Chemical-Specific Representation of Air-Soil Exchange and Soil Penetration in Regional Multimedia Models, article, August 1, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc781697/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.