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Mass Transfer Studies in Sorbing Porous Media: III. Experimental Evaluation with 2,4,5‐T
Author(s) -
Genuchten M. Th.,
Wierenga P. J.,
O'Connor G. A.
Publication year - 1977
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1977.03615995004100020023x
Subject(s) - adsorption , desorption , diffusion , hysteresis , mass transfer , effluent , porous medium , aggregate (composite) , chemistry , porosity , thermodynamics , materials science , chromatography , environmental science , environmental engineering , composite material , organic chemistry , physics , quantum mechanics
Comparisons are made between observed and calculated effluent concentration distributions for the movement of 2,4,5‐T (2,4,5‐trichlorophenoxyacetic acid) through 30‐cm long unsaturated soil columns. The comparisons are made using both analytical and numerical solutions of a previously published model, which included the effects of intra‐aggregate diffusion and adsorption. The results in this study indicate that intra‐aggregate diffusion and adsorption/desorption are the main mechanisms responsible for effluent tailing. An estimated 60% of the adsorption. Was found to occur in the stagnant region of the soil. When intra‐aggregate diffusion was included in the model, the observed adsorption/desorption hysteresis phenomenon found to be significant in several earlier studies, was shown to be much less important in describing the observed concentration distributions.