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| Impact of specific ion effects on the coagulation kinetics of cinnamon and black soil colloids |
| Received:July 02, 2025 |
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| KeyWord:black soil colloids;cinnamon soil colloids;zeta potential;critical coagulation concentration;specific ion effects |
| Author Name | Affiliation | E-mail | | YANG Qiongfang | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture and Rural Affairs, Northwest A&F University, Yangling 712100, China | | | YAN Yuyang | State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling 712100, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources, Yangling 712100, China | | | YANG Dongming | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture and Rural Affairs, Northwest A&F University, Yangling 712100, China | | | DU Wei | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture and Rural Affairs, Northwest A&F University, Yangling 712100, China | | | HU Feinan | State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling 712100, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources, Yangling 712100, China | | | XU Chenyang | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture and Rural Affairs, Northwest A&F University, Yangling 712100, China | xuchenyang@nwafu.edu.cn |
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| 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++++, 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+2+, 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. |
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