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This article in JEQ

  1. Vol. 38 No. 4, p. 1608-1616
     
    Received: July 29, 2008
    Published: July, 2009


    * Corresponding author(s): mselim@agctr.lsu.edu
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doi:10.2134/jeq2008.0343

Mercury Adsorption-Desorption and Transport in Soils

  1. Lixia Liaoa,
  2. H. M. Selim *a and
  3. R. D. DeLauneb
  1. a School of Plant, Environmental and Soil Sciences
    b Dep. of Oceanography and Coastal Science, Louisiana State Univ., Baton Rouge, LA 70803. Contribution from Louisiana State University Agricultural Center as manuscript no. 2009-306-2447

Abstract

Kinetic sorption and column miscible displacement transport experiments were performed to quantify the extent of retention/release and the mobility of mercury in different soils. Results indicated that adsorption of mercury was rapid and highly nonlinear with sorption capacities having the following sequence: Sharkey clay > Olivier loam > Windsor sand. Mercury adsorption by all soils was strongly irreversible where the amounts released or desorbed were often less than 1% of that applied. Moreover, the removal of soil organic matter resulted in a decrease of mercury adsorption in all soils. Adsorption was described with limited success using a nonlinear (Freundlich) model. Results from the transport experiments indicated that the mobility of mercury was highly retarded, with extremely low concentrations of mercury in column effluents. Furthermore, mercury breakthrough curves exhibited erratic patterns with ill-distinguished peaks. Therefore, mercury is best regarded as strongly retained and highly “immobile” in the soils investigated. This is most likely due to highly stable complex formation (irreversible forms) and strong binding to high-affinity sites. In a column packed with reference sand material, a symmetric breakthrough curve was obtained where the recovery of mercury in the leachate was only 17.3% of that applied. Mercury retention by the reference sand was likely due to adsorption by quartz and metal-oxides.

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Copyright © 2009. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyAmerican Society of Agronomy, Crop Science Society of America, and Soil Science Society of America

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