Pedosphere 13(4): 317--322, 2003
ISSN 1002-0160/CN 32-1315/P
©2003 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Exchange reaction between selenite and hydroxyl ion of variable charge soil surfaces: Ⅱ. Kinetics of hydroxyl release
ZHOU Shi-Wei1, ZHANG Gang-Ya1 and ZHANG Xiao-Man
Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China). E-mail: swzhou77@163.com
ABSTRACT
      A self-made constant pH automated titration instrument was used to study the kinetics of hydroxyl release during selenite reacting with variable charge soils. The rate of hydroxyl release was very rapid at the first several minutes, then gradually slowed down, and at last did not change any more. The experimental data was well fitted by the Langmuir kinetic equation, and with increasing selenite concentration or decreasing solution pH, the reaction lasted longer, the maximum of hydroxyl release (xm) increased, and the binding constant (k) decreased. The time of hydroxyl release with Xuwen latosol was much longer than that with Jinxian red soil.
Key Words:  hydroxyl release, ion exchange reaction, Langmuir kinetic equation, selenite adsorption, variable charge soils
Citation: Zhou, S. W., Zhang, G. Y. and Zhang, X. M. 2003. Exchange reaction between selenite and hydroxyl ion of variable charge soil surfaces: Ⅱ. Kinetics of hydroxyl release. Pedosphere. 13(4): 317-322.
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