Effects of methamidophos and glyphosate on copper sorption-desorption behavior in soils

Abstract： A batch-equilibration technique was employed to study the impact of two organophosphorus pesticides methamidophos (MDP) and glyphosate (GPS) on copper (Cu2+) sorptiondesorption for phaeozem and burozem collected from Northeastern China. The addition of the two pesticides decreased Cu2+ sorption, increased Cu2+ desorption and prolonged the equilibrium time of Cu2+ sorption-desorption. But GPS appeared to exert a stronger influence on Cu2+ sorption-desorption due to its stronger complexion with Cu2+. When MDP was added, Cu2+ sorption-desorption was linearly correlated with MDP treatment concentrations. But in the presence of GPS, Cu2+ sorption first underwent a rapid decrease period, and then slowly tended towards a steady period. The reverse pattern could be found for Cu2+ desorption in the presence of GPS.Without pesticides and with the existence of MDP, Cu2+ sorption-desorption kinetics was well conformed to two-constant equation and Elovich equation. But that was not the case for Cu2+ desorption kinetics in the presence of GPS although its sorption could be also described by these two equations. 作 者： YU Ying    ZHOU Qixing    He Zhenli   作者單位： YU Ying,ZHOU Qixing(Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China)

He Zhenli(College of Natural Resources and Environmental Sciences, Zhejiang University, Hangzhou 310029, China) 

期 刊： 中國科學C輯（英文版）  SCI   Journal： SCIENCE IN CHINA SERIES C(LIFE SCIENCES)  年，卷(期)： 2005, 48(z1)  分類號： X5  Keywords： Cu    sorption    desorption    methamidophos    glyphosate    phaeozem    burozem   

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