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This article in JEQ

  1. Vol. 40 No. 3, p. 942-948
     
    Received: Oct 12, 2010
    Published: May, 2011


    * Corresponding author(s): chefetz@agri.huji.ac.il
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doi:10.2134/jeq2010.0446

Interactions of Carbamazepine in Soil: Effects of Dissolved Organic Matter

  1. Rotem Navona,
  2. Selene Hernandez-Ruizb,
  3. Jon Choroverb and
  4. Benny Chefetz *a
  1. a Dep. of Soil and Water Sciences, Faculty of Agriculture, Food and Environment, The Hebrew Univ. of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
    b Dep. of Soil, Water and Environmental Science, Univ. of Arizona, Tucson, AZ 85721. Assigned to Associate Editor Myrna Simpson

Abstract

Pharmaceutical compounds (PCs) and dissolved organic matter (DOM) are co-introduced into soils by irrigation with reclaimed wastewater. We targeted carbamazepine (CBZ) as a model compound to study the tertiary interactions between relatively polar PCs, DOM, and soil. Sorption–desorption behavior of CBZ was studied with bulk clay soil and the corresponding clay size fraction in the following systems: (i) without DOM, (ii) co-introduced with DOM, and (iii) pre-adsorption of DOM before CBZ introduction. Sorption of the DOM to both sorbents was irreversible and exhibited pronounced sorption–desorption hysteresis. Carbamazepine exhibited higher sorption affinity and nonlinearity, and a higher degree of desorption hysteresis with the bulk soil than the corresponding clay size fraction. This was probably due to specific interactions with polar soil organic matter fractions that are more common in the bulk soil. Co-introduction of CBZ and DOM to the soil did not significantly affect the sorption behavior of CBZ; however, following pre-adsorption of DOM by the bulk soil, an increase in sorption affinity and decrease in sorption linearity were observed. In this latter treatment, desorption hysteresis of CBZ was significantly increased for both sorbents. We hypothesize that this was due to either strong chemical interactions of CBZ with the adsorbed DOM or physical encapsulation of CBZ in DOM–clay complexes. Based on this study, we suggest that DOM facilitates stronger interactions of polar PCs with the solid surface. This mechanism can reduce PC desorption ability in soils.

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Copyright © 2011. 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