农业环境科学学报2026，Vol.45Issue(5)：1157-1167,封3,12.DOI:10.11654/jaes.2025-0625
离子特异性效应对褐土和黑土胶体凝聚动力学特征的影响
Impact of specific ion effects on the coagulation kinetics of cinnamon and black soil colloids
摘要
Abstract
To clarify the specific ion effects on the surface properties and suspension stability of soil colloids under different environmental conditions,cinnamon soil colloids and black soil colloids were selected as research subjects.The coagulation kinetics characteristics,zeta potential changes,and critical coagulation concentrations of the two soil colloids in LiCl,NaCl,KCl,CsCl,MgCl2,and CaCl2 solutions were measured.The results showed that the average diameter of black soil colloids was larger than that of cinnamon soil colloids.Under the same monovalent cation concentration conditions,the zeta potential values of black soil colloids followed the order:Li+＜Na+＜K+＜Cs+,which was consistent with the trend observed in cinnamon soil colloids.In the presence of divalent cations,the zeta potential values of black soil colloids showed the order:Mg2+＜Ca2+,which was the opposite of the trend observed in cinnamon soil colloids.The fractal dimension of the clusters formed by cinnamon soil colloids in the K+system was the largest,indicating the loosest structure.For black soil colloids,the maximum fractal dimension was observed in the Ca2+system.The critical coagulation concentrations of cinnamon soil colloids in the Na+,K+,and Cs+systems were 1.31,2.55,and 9.69 times those in the Li+system,respectively.For black soil colloids,the critical coagulation concentrations in the Na+,K+,and Cs+systems were 1.83,4.79,and 17.93 times those in the Li+system,respectively.The critical coagulation concentrations induced by different ions exhibited a significant ion-specific effect.The type of cation regulates colloid stability through hydration radius and valence state,but there are notable differences in the response of different soil colloids to specific ions(especially Mg2+/Ca2+),which are related to the material composition and surface charge density of the colloids.The ion-specific effect significantly influences the stability and cluster structure of soil colloids.关键词
黑土胶体/褐土胶体/Zeta电位/临界聚沉浓度/离子特异性效应Key words
black soil colloids/cinnamon soil colloids/zeta potential/critical coagulation concentration/specific ion effects分类
农业科技引用本文复制引用
杨琼芳,闫雨阳,杨东明,杜伟,胡斐南,许晨阳..离子特异性效应对褐土和黑土胶体凝聚动力学特征的影响[J].农业环境科学学报,2026,45(5):1157-1167,封3,12.基金项目
陕西省自然科学基金面上项目(2023-JC-YB-263) （2023-JC-YB-263）
国家自然科学基金面上项目(42277311)Natural Science Foundation of Shaanxi Province,China(2023-JC-YB-263) （42277311）
National Natural Science Foundation of China(42277311) （42277311）
