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Citation: ZHAO Jin-Jin, HE Xiao-Min, FENG Wei-Liang, CHEN Rui-Wen, LI Sheng-Qing, CHEN Hao, HUANG Qiao-Yun. Adsorption/Desorption Characteristics of Methyl Parathion and Carbaryl on Clay Minerals[J]. Chinese Journal of Applied Chemistry, ;2010, 27(1): 112-116. shu

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

a.
a. College of Sciences, Huazhong Agriculture University, Wuhan 430070;
b.
b. Key Laboratory of Subtropical Agricultural Resources and Environment, Ministry of Agriculture, Huazhong Agriculture University, Wuhan 430070

Received Date: 20 January 2009
Available Online: 18 April 2009
Fund Project: 国家自然科学基金(40571084) (40571084)校交叉学科基金(2008XKJC001) 资助项目 (2008XKJC001)

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 its 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.
- methyl parathion,
- carbaryl,
- clay minerals,
- adsorption
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