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Modeling Reactive Gas Uptake, Transport, and Transformation in Aggregated Soils

Dep. of Chemical Engineering, Chalmers Univ. of Technology, S-41296 Gothenburg, Sweden

Thomas Gimmi and Hannes Flühler

Dep. of Soil Physics, ETH-Zentrum, CH-8092 Zürich, Switzerland

*Corresponding author.

ABSTRACT

Gas diffusion research in soils covers, to a large extent, the transport behavior of practically insoluble gases. We extend the mathematical description of gas transport to include reactive gaseous components that hydrolyze in water such as SO₂ and CO₂. The path between the free atmosphere and the microporous niches is modeled by assuming penetration through gas-filled macropores, air-water phase transfer, and diffusion and speciation in the liquid phase. For hydrolyzable gases, the rate of mass transfer into and the total absorption capacity of the soil solution may be high. Both the capacity and the transfer rate are influenced by the soil-solution pH; for high pH, they become extremely high for SO₂. The soil absorption of such gases is also influenced by soil structure. Well-aerated, near-neutral soils are a potentially important sink for SO₂.

Received for publication January 23, 1989.