Exchange Reaction Between Selenite and Hydroxyl Ion of Variable Charge Soil Surfaces: Ⅱ. Kinetics of Hydroxyl Release

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.

作 者： Zhou Shi-Wei ZHANG Gang-Ya ZHANG Xiao-Nian   作者單位： Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 China  刊 名： 土壤圈(意譯名)  ISTIC SCI 英文刊名： PEDOSPHERE  年，卷(期)： 2003 13(4)  分類號： S15  關鍵詞： hydroxyl release   ion exchange reaction   Langmuir kinetic equation   selenite adsorption   variable charge soils  

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