The gaseous diffusion coefficient in soil air is much smaller than that in the atmosphere because of the limited fraction of total pore volume occupied by continuous air-filled pores and by pore tortuosity, where soil particles and water increase the mean path length available for diffusion. For ...
The gas-phase molecular diffusion coefficient for an unsaturated silica flour sample with total porosity of 0.386 and water saturation levels >50% was measured to be one order of magnitude less than those for the other samples with total porosities ranging from 0.402 to 0.417 at similar air-...
Furthermore, the soil pores in the capillary fringe were saturated with water, and the molecular diffusion coefficient of methane in air (2.1 × 10−1... M Jie,William G.Rixey,George E.DeVaull,... - 《Environmental Science & Technology》 被引量: 49发表: 2012年 ChemInform Abstract: Mol...
In this report, oil swelling, which is proportional to gas solubility, was measured against the elapsed time to estimate gas diffusion coefficient in oil by matching with the unsteady-state diffusion equation. It is relatively easy to measure the coefficient from direct measurements of gas ...
Grafting is one of the promising techniques for improving abiotic stress tolerance in horticultural crops, but the underlying regulatory mechanisms of drought on grafted grapevine are largely unexplored. Herein, we investigated the phenotypic, physiologi
[129] studied the interaction between the TNB humic acid model [68]–[70] and toluene (representative volatile organic compound) in vacuo. Specifically, the diffusion coefficient of toluene was characterized as a function of temperature from 300 to 400 K. The results obtained are in qualitative ...
their tendency to bioaccumulate in living organisms induced endocrine disruption, malformations and reproductive disorders which is a matter of serious concern10. Both these environmental stressors tend to accumulate in soil, air and water and induce adverse effects. Consequently, living organisms are ...
Clay minerals retain or adsorb metal ions in the Earth’s critical zone. Rocks, sediments and soils rich in clay minerals can concentrate rare earth elements (REEs) in ion adsorption-type deposits (IADs) and are similarly effective at metallic contaminan
Here a is the radius of a gas molecule, and D is the diffusion coefficient of bulk gas. (4.64)D=kT6πaη (Einstein–Stokes relation) where η stands for the viscosity of the gas. From Eqs. (4.63) and (4.64): (4.65)τF=3I18πηa3 The spin rotation mechanism leading to Eq. (4.6...
The research on the Grotthuss-like transport mechanism of WO3 in molten Na2WO4 shows that the mass transfer rate of this mechanism is about 1.5 times faster than the self-diffusion of tungsten ions. The bridging oxygen bond of W2O72- is longer, the Mayer bond level is lower and has a ...