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ABSTRACT
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.
1 Journal article no. 568, Agric. Exp. Stn., New Mexico State Univ., Las Cruces, NM 88003. The work upon which this report was based was supported in part by funds obtained from the U.S. Dep. of the Interior, Office of Water Resources Research, as authorized under the Water Resources Act of 1964.
2 Formerly Graduate Student, Dep. of Agronomy, New Mexico State Univ.; presently Research Associate, Dep. of Civil Engineering, Princeton Univ., Princeton, NJ 08540.
3 Associate Professor, Dep. of Agronomy, New Mexico State Univ., Las Cruces, NM 88003.
Received for publication March 8, 1976. Accepted for publication November 9, 1976.
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