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.

Soil research, Diffusion, Diffusion (Physics)

---

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%.

Influence, Hydrocarbon research, Transport theory, Vapors, Soil moisture

---

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.

Pollutants

Similar abstracts:

• Abstracts: Europeans clash over space station. Fitting planet Earth into a user-friendly database. ERS-1 gives Europeans new views of the oceans
• Abstracts: Investigation of nanomechanical properties of the interphase in a glass fiber reinforced polyester composite using nanoindentation
• Abstracts: New Music Center combines elegance and efficiency. New Center commercializes transportation technologies
• Abstracts: Effect of geometry and materials on residual stress management in thin films by using the focused ion beam. Structure and properties of electrocodeposited Cu-Al2O3 nanocomposite thin films
• Abstracts: A consistent criterion for diffuse necking in sheet metals using Hill's 1979 yield surface. On serrated plastics flow in an AA5052-H32 sheet

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.