河流溶解性物质解吸数学模式比较与分析

针对河流溶解性物质侵蚀时的界面解吸过程,总结了计算可溶性物质解吸总量时最具代表性的稳态模型,包括Herry模型、Langrauir模型、Freundlich模型和表面络合模型,并运用以Ca2+为可溶性物质特征离子的静态试验成果,验证了上述各种模型的有效性.通过比较和分析发现,由于可溶性物质在解吸和吸附时初始赋存状态的差异,这些模型都未有考虑可溶性物质解吸时的扩散过程.最后,对溶解性物质的解吸模式进行了分析,指出溶解性物质解吸是扩散与离子交换综合的过程;并在此基础上,对现有模型进行了改进,把可溶性物质解吸总量分成扩散总量和离子交换总量两大部分.

Analysis on Models for Predicting the Desorption Quantity of Soluble Matters in Rivers

Regarding to the desorption of the soluble matter erosion in rivers, the currently used steady-state models including Herry model, Langmuir model, Freundlich model and Surface Complexation model for predicting the desorption quantity of soluble matters were summarized. Taking Ca2+ as the representative index of soluble matters and based on the static state experimental results, the validity of the above four models were checked. The comparison indicated that because the initial occurrence of soluble matters in desorption was greatly different from it in sorption, the diffusion process in desorption was not considered in any of the above models. Then by the analysis of the desorption mode of soluble matters, it was found that the desorption was an integrated process of diffusion and ion exchange. At last, the above models were improved in which the total desorption quantity of soluble matters was devided into diffusion quantity and ion exchange quantity.