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

Science china(Life sciences) 2005年第Z1期48卷 67-75页

作者： yu ying, zhou qixing & he zhenli key laboratory of terrestrial ecological process, institute of applied ecology, chinese academy of sciences, shenyang 110016, china College of Natural Resources and Environmental sciences, Zhejiang University, Hangzhou 310029, china key laboratory of terrestrial ecological process Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China College of Natural Resources and Environmental sciences Zhejiang University Hangzhou 310029 China

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 *** 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.

关键词： Cu, sorption, desorption, methamidophos, glyphosate, phaeozem, burozem.

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