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Adsorption–Desorption Behavior of Copper at Contaminated Levels in Red Soils from China

S. Yu, Z.L. He{dagger},*, C.Y. Huang, G.C. Chen and D.V. Calvert{dagger}

Dep. of Resource Science, College of Environmental and Resource Sciences, Huajiachi Campus, Zhejiang Univ., Hangzhou, China 310029



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  		Fig. 1. Isotherms of Cu2+ adsorption in the two red soils. RAR, red soil developed on Arenaceous rock (clayey, mixed siliceous thermic typic Dystrochrept); REQ, red soil developed on Quaternary red earths (clayey, kaolinitic thermic plinthite Aquult).

 


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  		Fig. 2. The pH changes and proton release in relation to Cu2+ adsorption in the two red soils. RAR, red soil developed on Arenaceous rock (clayey, mixed siliceous thermic typic Dystrochrept); REQ, red soil developed on Quaternary red earths (clayey, kaolinitic thermic plinthite Aquult).

 


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  		Fig. 3. Effect of initial Cu2+ concentration on proton release per Cu2+ adsorbed (H+ to Cu2+ ratio) in the two red soils. RAR, red soil developed on Arenaceous rock (clayey, mixed siliceous thermic typic Dystrochrept); REQ, red soil developed on Quaternary red earths (clayey, kaolinitic thermic plinthite Aquult).

 


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  		Fig. 4. Effect of initial Cu2+ concentration on Cu2+ distribution coefficient (Kd) in the two red soils. RAR, red soil developed on Arenaceous rock (clayey, mixed siliceous thermic typic Dystrochrept); REQ, red soil developed on Quaternary red earths (clayey, kaolinitic thermic plinthite Aquult).

 


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  		Fig. 5. Fractions of five successive extractions and residual Cu2+ in the total adsorbed Cu2+. The terms D1 to D5 represent the fraction of desorbed Cu2+ from each of the five successive extractions and the residual Cu2+ represents the fraction of adsorbed Cu2+ that is not recovered by the five successive extractions with 1 mol L-1 NH4Ac (pH 5.0). RAR, red soil developed on Arenaceous rock (clayey, mixed siliceous thermic typic Dystrochrept); REQ, red soil developed on Quaternary red earths (clayey, kaolinitic thermic plinthite Aquult).

 




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The SCI Journals Agronomy Journal Crop Science
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