本文研究了稀土离子Pr3+和Y3+在黄河水中与沉积物的相互作用特性及pH值对吸附作用的影响。结果表明，黄河水中Pr3+和Y3+与沉积物相互作用的吸附等温线具有一个“拐点”两个“平台”，是一种台阶型的二级交换等温线。用分级离子交换等温式求出了平衡常数K1和K2。pH值是影响吸附作用的主要因素，随着pH值的增大沉积物与稀土离子的交换吸附作用相应增强。
The isotherms of the interaction between rare earth ion and sediments in Yellow River were studied by applying the theory and method of interfacial stepwise ion/coordination particle exchange.The results show that the isotherms of the interaction between praseodymium and yttrium ions and the sediments are the stepped.The adsorption equilibrium constants K1 and K2 were calculated by the isothermal equation of surface stepwise ion exchange.The exchange adsorption effect between sediments and praseodymium is stronger ion exchange.The exchange adsorption effect between sediments and praseodymium is stronger than that between sediments and yttrium.The interaction enhances with increasing of the pH value.
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