静止水域中溶解性物质解吸模式初探

Study on desorption model of soluble matters in static water

针对河流溶解性物质侵蚀时的微观界面过程,本文分析了静止水域中溶解性物质的解吸过程,指出溶解性物质的解吸是扩散过程与离子交换过程的综合体现,并以此为基础,通过理论分析,建立了溶解性物质平衡解吸的数学模式。最后运用以Ca2+为溶解性物质特征离子的静态试验成果,对所建立的解吸模式进行了验证。验证结果表明,该模式能较好地计算溶解性物质的解吸结果,尤其能较为准确地描述解吸溶液中初始电解质浓度及泥沙颗粒浓度对溶解性物质解吸的影响。该模式具有明确的物理意义,可为进一步研究天然条件下河流溶解性物质侵蚀提供理论依据。

Aiming at the micro interface processes of soluble matters erosion in rivers, the desorption process of soluble matters in static water was analyzed in this study. It was indicated that this is a coupled process of diffusion and ion exchange. Through theoretical analysis, a mathematical equilibrium desorption model of soluble matters was established and verified experimentally using Ca2＋ as the representative ion of soluble matters in the static state test results. The verification shows that this is an effective model, and especially, it can accurately describe the effects of initial electrolyte and sediment concentration on the desorption in solution. Thus, the model would provide a theoretical basis for the study of soluble matters erosion in rivers.