Solute transport in clay media: effect of humic acid

Article Abstract:

Humic materials clog access pores and bind cations to reduce access to the inner layer region of clay stacks. This was the main finding in a study of the ability of humic materials to remove cations from the gallery region of clay stacks. Using clay-modified electrodes to directly monitor solute transport, it was found that humic acid lowers the amount of free cation in the interlayer domain by competing with clay for cations and by physically blocking access to the clay pores.

Analysis, Biological transport, Humic acid, Humic acids, Clay

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Temporal, spatial, and resolution constraints for in situ sampling devices using diffusional equilibration: dialysis and DET

Article Abstract:

There are some limitations and guidelines to the use of diffusional equilibration in thin films (DET) and dialysis sampling techniques during in situ analysis. For example, the equilibration time is directly proportional to the thickness of the gel layer or the depth or the peeper cell, but it is inversely proportional to the solute diffusion coefficient. Additionally, the performance of the DET technique improves as the width of the porewater maximum increases.

Dialysis, Dialysis (Chemical process), Diffusion processes

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Diffusional transport of solutes through clay: use of clay-modified electrodes

Article Abstract:

Loyola University researchers used clay-modified electrodes to measure the migration of soluble pollutants through clay liners situated beneath waste sites. Migration measurements for Cl and trichlorophenol indicated that pollutants could breach liners within a five-year period. Researchers used models consisting of large core volumes as well as clay films 10 cm in diameter.

Testing laboratories, Environmental aspects, Underground waste disposal, Sewage disposal, Soil permeability, Clay soils, Sewage disposal in the ground

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