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This article in SSSAJ

  1. Vol. 41 No. 2, p. 278-285
    Received: Mar 8, 1976
    Accepted: Nov 9, 1976

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Mass Transfer Studies in Sorbing Porous Media: III. Experimental Evaluation with 2,4,5-T1

  1. M. Th. van Genuchten2,
  2. P. J. Wierenga3 and
  3. G. A. O'Connor3



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.

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