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This article in JEQ

  1. Vol. 31 No. 5, p. 1716-1721
    Received: Nov 20, 2001

    * Corresponding author(s): jhlee@utk.edu
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Sorption and Transport Behavior of Naphthalene in an Aggregated Soil

  1. Jaehoon Lee *a,
  2. Lakhwinder S. Hundalb,
  3. Robert Hortonc and
  4. Michael L. Thompsonc
  1. a Biosystems Engineering and Environmental Science Dep., The University of Tennessee, Knoxville, TN 37996
    b Dep. of Civil Engineering and Geological Sciences, University of Notre Dame, Notre Dame, IN 46556
    c Dep. of Agronomy, Iowa State University, Ames, IA 50011


Soil solution chemistry influences the sorption and transport behavior of hydrophobic organic compounds (HOCs) in soil. We used both batch and column studies to investigate the influence of ionic strengths (0.03 and 1.5 M) and flow velocities (12 and 24 cm h−1) on sorption and transport of naphthalene (NAP) in aggregated soil. Sorption parameters such as the Freundlich coefficient (K f) and exponent (n) calculated from batch studies and column experiments were also compared. Retardation of NAP transport was greater at higher solution ionic strength, which may be attributed to greater sorption affinity due to enhanced aggregation of the sorbent. The effect of ionic strength on sorption of NAP observed in the batch study was consistent with the results from the column study. The K f and n values obtained from the batch study for the two ionic strengths ranged from 7.8 to 13.7 and 0.68 to 0.80, respectively, whereas the K f and n values obtained from the column study ranged from 7.9 to 9.9 and 0.73 to 0.85, respectively. The effluent breakthrough curve (BTC) of NAP at a flow rate of 24 cm h−1 showed significant chemical and physical nonequilibrium behavior, implying that a considerable amount of sorption in aggregated soil was time dependent when flow was relatively fast. The BTCs calculated with the parameters determined from batch studies compared poorly with the measured BTCs. The potential for nonequilibrium transport should be incorporated in models used for predicting the fate and transport of HOCs. Furthermore, caution is required when extrapolating the results from batch studies, especially for aggregated soils.

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Copyright © 2002. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyPublished in J. Environ. Qual.31:1716–1721.