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研究论文

摘要：通过在Cr(Ⅵ)溶液中加入0.01mol/L KH₂PO₄方法把土壤对Cr(Ⅵ)吸附和还原作用加以区分,研究了几种土壤对Cr(Ⅵ)吸附和还原动力学。结果表明:土壤中Cr(Ⅵ)的还原反应基本上可由两个一级反应来表示,其反应速率常数与土壤有机质含量及其可氧化性有关,土壤对Cr(Ⅵ)的吸附过程可用Elovich公式、双常数速率公式和抛物线扩散公式来描述,土壤对Cr(Ⅵ)的吸附量与游离氧化铁含量密切相关,随反应时间的延长,Cr(Ⅵ)吸附量占溶液中Cr(Ⅵ)减少量的比例下降,Cr(Ⅵ)还原量所占比例逐渐增加。

Abstract：Adsorption and reduction of Cr (Ⅵ) in several soils were studied and the results showed that the reduction process consists of two first-order reactions and the rate of the reaction is positively correlated to the content of soil organic matter. On the other hand, the amount of Cr(Ⅵ) adsorbed is closely related to the content of free ferric oxide and increased remarkably after removing the soil organic matter. The adsorption curves may be well fitted by Elovich equation, parabolic diffusion equation and two-constant rate equation.