Adsorption kinetics of toluene on soil agglomerates: soil as a biporous sorbent

Article Abstract:

A gravimetric method and a headspace gas chromatographic technique were used to generate equilibrium and kinetic data for adsorption of toluene vapor on Yolo loam and montmorillonite clay. Adsorption of toluene from the gas phase occurred in two stages. The first stage was due to fast diffusion and adsorption in macropores, while the second was controlled by slower diffusion and adsorption in intragrain micropores. Biporous diffusion models are necessary in describe the adsorption history of toluene in Yolo soil and montmorillonite, especially its diffusional attributes in macropores and micropores with nonlinear adsorption.

Analysis, Toluene

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Gas-phase transport and sorption of benzene in soil

Article Abstract:

Benzene adsorption isotherms and breakthrough curves are predicted to study the transport of gaseous organic compounds in dry and slightly moist soil. The differential adsorption bed technique was used to measure sorption capacities and rates of adsorption and desorption. The nonlinear Freundlich isotherm describes the dry soil sorption equilibrium, gradually shifting to linear while soil sorption capacity decreases as the relative humidity increases from zero to 33%. Adsorption occurs faster than desorption in dry soil, while adsorption and desorption kinetics are faster and asymmetric in moist soil.

Petrochemical Manufacturing, Benzene, Environmental aspects

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Molecular topology/fragment contribution method for predicting soil sorption coefficients

Article Abstract:

A method to predict soil sorption coefficients based on polar compound fragment correction factors and the first-order molecular connectivity index is developed and evaluated. The study found that the new method was more effective in predicting sorption coefficients for polar compounds than the use of such information as water solubilities or octanol/water partition coefficients. A database of measured soil sorption coefficients is also given.

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