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Comparison of models that describe the transport of organic compounds in macroporous soil

Journal Article · · Environmental Toxicology and Chemistry
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Abstract

Experiments were conducted on an intact soil column to test the suitability of several transport codes in describing the movement of reactive organic compounds through soil containing preferred flow pathways (macropores). The equilibrium-based advection-dispersion model and the nonequilibrium two-region/two-site model were used to describe the elution of a nonretarded tracer ([14C]methanol) and two retarded tracers (trichlorobenzene and tetrachlorobenzene). The advection-dispersion model proved adequate in describing the movement of the nonreactive tracer but it failed to describe the elution of the hydrophobic organics. The organic tracers required the nonequilibrium model to account for their apparent rapid movement. The two-site model, when calibrated to the trichlorobenzene breakthrough data, successfully predicted the elution of tetrachlorobenzene.

Sponsoring Organization:
USDOE
OSTI ID:
2496769
Journal Information:
Environmental Toxicology and Chemistry, Journal Name: Environmental Toxicology and Chemistry Journal Issue: 4 Vol. 6; ISSN 0730-7268
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

References (11)

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Preferential solute movement through larger soil voids. I. Some computations using simple theory journal January 1978
Nitrate loss in soil drainage waters in relation to by‐passing flow and discharge on an arable site journal September 1983
Lysimeter Measurements of Nitrate and Chloride Losses from Soil Under Conventional and No‐tillage Corn journal January 1977
Consequences of Water Movement in Macropores journal April 1979
Chloride and Tritiated Water Flow in Disturbed and Undisturbed Soil Cores journal September 1974
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Experimental and Mathematical Description of Nonadsorbed Solute Transfer by Diffusion in Spherical Aggregates1 journal January 1980
Solute Transport in Aggregated Porous Media: Theoretical and Experimental Evaluation1 journal January 1980
Chloride Movement in Undisturbed Soil Columns journal May 1981

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