离子界面反应对土壤孔隙状况的影响机制

宋孝帅; 何家洪; 丁武泉; 刘新敏

doi:10.13961/j.cnki.stbctb.20230131.001

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离子界面反应对土壤孔隙状况的影响机制

试验研究

- 离子界面反应对土壤孔隙状况的影响机制
- Influence Mechanism of Ionic Interface Reaction on Soil Porosity
- 水土保持通报 2023年43卷第3期页码：47-53
- 作者机构：
  
  1. 重庆文理学院化学与环境工程学院, 环境材料与修复技术重庆市重点实验室,重庆,402160
  2. 重庆三峡学院环境与化学工程学院, 三峡库区地质环境监测与灾害预警重庆市重点实验室,重庆,404100
  3. 西南大学资源环境学院,重庆,400716
- 作者简介：
- 基金信息：
  
  重庆市自然科学基金项目“土—水界面相互作用下三峡消落带土壤团聚体稳定性机制”(cstc2018jcyjAX0354),重庆市自然科学基金(CSTB2022NSCQ-MSX1670);重庆市教委科学技术研究重点项目(KJZD-K201901305);三峡库区地质环境监测与灾害预警重庆市重点实验室开放资助项目(MP2020B0601)
- DOI：10.13961/j.cnki.stbctb.20230131.001
  中图分类号： S152;S153.3
- 纸质出版：2023
- 稿件说明：
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宋孝帅, 何家洪, 丁武泉, 等. 离子界面反应对土壤孔隙状况的影响机制[J]. 水土保持通报, 2023,43(3):47-53.

Song Xiaoshuai, He Jiahong, Ding Wuquan, et al. Influence Mechanism of Ionic Interface Reaction on Soil Porosity[J]. Bulletin of Soiland Water Conservation, 2023, 43(3): 47-53.
宋孝帅, 何家洪, 丁武泉, 等. 离子界面反应对土壤孔隙状况的影响机制[J]. 水土保持通报, 2023,43(3):47-53. DOI： 10.13961/j.cnki.stbctb.20230131.001.

Song Xiaoshuai, He Jiahong, Ding Wuquan, et al. Influence Mechanism of Ionic Interface Reaction on Soil Porosity[J]. Bulletin of Soiland Water Conservation, 2023, 43(3): 47-53. DOI： 10.13961/j.cnki.stbctb.20230131.001.

摘要

[目的

]

分析不同价态离子对土壤颗粒表面电荷性质、颗粒间净作用力的变化规律，阐明离子界面颗粒的相互作用对孔隙状况的影响机制。[方法

]

利用工业CT扫描技术，对不同价态离子条件下的土壤孔隙状况进行测定，并分析了其形成的土壤孔隙特征差异。[结果

]

①Mg

体系下土体中孔隙数量远大于Na

体系孔隙数量，为其1.43倍，其中，＞1 mm孔隙数量分别占1.43%，1.06%。②Mg

，Na

体系土体中＞1 mm土壤孔隙体积占所有孔隙体积比例分别为50.4%，40.2%；而且，Mg

体系下土体中＞1 mm土壤孔隙体积是Na

体系的1.42倍，Na

，Mg

体系土体中土壤孔隙度分别为2.06%，2.35%。③随着Na

，Mg

浓度升高，紫色土的表面电位分别从-391.7 mV降至-96.7 mV，从-167.3 mV降至-67.0 mV。在相同浓度下，紫色土表面电位(绝对值)表现为Na

大于Mg

。④随着Na

，Mg

浓度的升高，土壤颗粒间净作用力呈减小规律，在同一浓度下，Mg

体系下紫色土颗粒间静电斥力小于Na

体系，同时，在Na

，Mg

体系下，紫色土胶体颗粒间表现为净引力的临界浓度值分别为0.1 mol/L，0.005 mol/L。[结论

]

，Mg

通过改变紫色土颗粒表面电荷性质，进而引起土壤颗粒间相互作用力发生变化，最终影响土壤的孔隙状况。

Abstract

[Objective] The changes in surface charge properties of soil particles and the net force between particles were analyzed

in order to elucidate the influence mechanism of particle interaction on pore conditions.[Methods] Soil pore conditions under different valence ion conditions were measured and the differences in soil pore characteristics formed by them were analyzed using industrial CT scanning techniques.[Results] ① The number of soil pores under the Mg2+ system was much larger (1.43 times) than the number of soil pores under the Na+ system. The number of soil pores (>1 mm) accounted for 1.43% and 1.06% of the total number of pores for the two respective systems. ② The pore volume of the soil pores (>1 mm) accounted for 50.4% and 40.2% of the total pore volume of the two respective systems. Additionally

the volume of the soil pores (>1 mm) for the Mg2+ system was 1.42 times higher than for the Na+ system. Soil porosity in the soils of the Na+ and Mg2+ systems was 2.06% and 2.35%

respectively. ③ As the concentrations of Na+ and Mg2+ increased

the surface potential of purple soil decreased from -391.7 mV to -96.7 mV and from -167.3 mV to -67.0 mV

respectively. At the same concentration

the surface potential (absolute value) of purple soil showed that Na+ exhibited greater performance than Mg2+. ④ The net force between soil particles decreased with increasing Na+ and Mg2+ concentrations. At the same concentration

the electrostatic repulsion between purple soil particles in the Mg2+ system was smaller than in the Na+ system. The critical concentration values of the net gravitational force exhibited between purple soil colloidal particles in the Na+ and Mg2+ systems were 0.1 mol/L and 0.005 mol/L

respectively.[Conclusion] Na+ and Mg2+ changed the pore condition of the soil by changing the surface charge properties of purple soil particles

which in turn caused changes in the interaction forces between soil particles

ultimately affecting the pore condition of the soil.

关键词

Keywords

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