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pH值影响Cd在红壤中吸附行为的实验研究

Keywords: ,pH,红壤,吸附行为

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Abstract:

以红壤为供试土壤,研究了其在不同pH值下对Cd(Ⅱ)吸附的特性,同时进行了沉淀反应的理论分析。Cd(Ⅱ)的吸附曲线可划分为3区:低pH弱吸附区;中pH值吸附增长区和高pH值强吸附区。根据Cd与土壤间专性吸附化学反应式建立了Cd在土壤中分配系数与pH的线性方程,试验数据按所建方程进行拟合的结果表明,相关系数随pH的升高而显著升高,意味着随pH值的升高,供试红壤对Cd(Ⅱ)的专性吸附作用加强。沉淀反应的理论分析表明,当土壤溶液pH低于11时,沉淀反应都为碳酸盐控制。试验数据的不同吸附模型拟合结果表明,Langmuir能较好地描述Cd(Ⅱ)在红壤里的吸附行为。最后根据Langmuir模型中参数与pH的关系,建立了试验条件下红壤对Cd(Ⅱ)吸附等温线的pH依存方程。

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