Effective gas-phase diffusion coefficients in soils at varying water content measured using a one-flow sorbent-based technique
Article Abstract:
A study was conducted on gas-phase diffusion coefficients in unsaturated soils. Steady-state and unsteady-state methods and a new one-flow sorbent-based technique were used at various water contents. Results showed a curvilinear relationship between the effective diffusion coefficient and air-filled porosity. The one-flow sorbent-based technique was found to provide improved characterization of diffusive processes in soils due to its convenience and flexibility.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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Hydrocarbon vapor transport in low moisture soils
Article Abstract:
The effects of soil moisture on hydrocarbon vapor transport in unsaturated soils were examined. Steady- and unsteady state approaches were used to investigate various sorption, diffusion and retardation parameters in column systems. Results revealed that absorption and vapor transport in soil depends on humidity and that in hydrocarbon vapors were significantly retarded in sand, loam and glass bead media when humiditis were lower than 30%.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1995
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Bioavailability and transformation of highly chlorinated dibenzo-p-dioxins and dibenzofurans in anaerobic soils and sediments
Article Abstract:
Anaerobic river sediments and aquifer material were used to evaluate the behavior of polychlorinated dibenzo-p-dioxins (PCDD) and dibenzo-furans (PCDF) under highly chlorinated conditions. Sedimentary anaerobic microbial activity contributed to the reductive dechlorination of PCDD/F. Desorption and concentration rates for both environmental pollutants affected transformation rates.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1995
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