Premium
Modeling Reactive Gas Uptake, Transport, and Transformation in Aggregated Soils
Author(s) -
Rasmuson Anders,
Gimmi Thomas,
Flühler Hannes
Publication year - 1990
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1990.03615995005400050002x
Subject(s) - soil water , macropore , mass transfer , microporous material , chemistry , aeration , sink (geography) , diffusion , soil gas , penetration (warfare) , absorption (acoustics) , environmental chemistry , gas phase , gaseous diffusion , soil science , environmental science , thermodynamics , chromatography , materials science , engineering , composite material , biochemistry , catalysis , mesoporous material , physics , cartography , organic chemistry , operations research , geography , electrode
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 SO 2 and CO 2 . 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 SO 2 . The soil absorption of such gases is also influenced by soil structure. Well‐aerated, near‐neutral soils are a potentially important sink for SO 2 .