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Soil Science Society of America Journal Abstract - DIVISION S-2—SOIL CHEMISTRY

Desorption Kinetics of Yttrium, Lanthanum, and Cerium from Soils


This article in SSSAJ

  1. Vol. 66 No. 4, p. 1198-1206
    Received: Apr 9, 2001

    * Corresponding author(s): xiaoquan@mail.rcees.ac.cn
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  1. Bei Wen,
  2. Xiao-quan Shan *,
  3. Jin-ming Lin,
  4. Gui-gang Tang,
  5. Nai-bin Bai and
  6. Dong-an Yuan
  1. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China


Study on desorption kinetics of Y, La, and Ce from soils is of importance because it relates to the bioavailability and potential toxicity of rare-earth elements. In the present study, a column-flow method and three models (first-order, two site first-order, and log-normal distribution first-order kinetics models) were used to describe the desorption kinetics of Y, La, and Ce from four Chinese soils with different physicochemical properties. A high desorption percentage of Y (87.1–96.6%), La (89.9–98.5%), and Ce (57.6–96.4%) from Yingtan soil was attributed to the low soil pH 5.43 and low organic matter of 1.53%. In contrast, a low percentage of Y (27.5–45.7%), La (27.6–53.6%), and Ce (1.09–50.8%) sorbed by Beijing, Tongjiang, and Haerbin soils desorbed probably because of the higher soil pH values of 8.24, 7.16, 7.23, and increased organic matter (36.4%) in Haerbin soil. The results also suggest that the first-order kinetics model did not offer an acceptable description of the data (R 2 < 0.90). However, excellent agreements were achieved between the experimental data and fits to the latter two kinetic models (R 2 > 0.99). The parameters derived from the kinetic equations indicated that increasing the initial sorption period from 1 to 20 wk could lead to a strong binding of rare-earth elements, resulting in slower desorption.

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Copyright © 2002. Soil Science SocietyPublished in Soil Sci. Soc. Am. J.66:1198–1206.