Chinese Journal of Applied Chemistry ›› 2010, Vol. 27 ›› Issue (01): 112-116.

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Adsorption/Desorption Characteristics of Methyl Parathion and Carbaryl on Clay Minerals

ZHAO Jin-Jin1, HE Xiao-Min1, FENG Wei-Liang1, CHEN Rui-Wen1, LI Sheng-Qing1, CHEN Hao1*, HUANG Qiao-Yun2   

  1. (1.College of Sciences;bKey Laboratory of Subtropical Agricultural Resources and Environment,
    2.Ministry of Agriculture,Huazhong Agriculture University,Wuhan 430070)
  • Received:2009-01-20 Revised:2009-04-17 Published:2010-01-10 Online:2010-01-10

Abstract:

??? Adsorption/desorption characteristics of methyl parathion and carbaryl on the surfaces of montmorillonite, kaolinite and goethite were investigated. The results show that the isotherm adsorption of??methyl parathion or carbaryl on clay minerals fitted Langmuir equation very well. Montmorillonite had a greater adsorption capacity for the two pesticides than goethite and kaolinite. Kinetics of methyl parathion or carbaryl adsorption could be described by First-order equation, Elovich equation and Two-constant equation. Elovich equation was the optimum model for their adsorption kinetics, the coefficients (R2) of which ranged between 0.93 and 0.98, indicating that the adsorption was a non-homogeneous diffusion process. The binding strength of methyl parathion and carbaryl on the minerals followed the sequence of montmorillonite > kaolinite > goethite.

Key words: methyl parathion, carbaryl, clay minerals, adsorption

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