水土保持学报2017，Vol.31Issue(4)：166-171,6.DOI:10.13870/j.cnki.stbcxb.2017.04.027
有机质对三峡库区水体中土壤胶体颗粒凝聚影响机制研究
Effect of Organic Matter on Aggregation of Soil Colloidal Particles in Water Bodies of Three Gorge Reservoir Region
摘要
Abstract
Based on the method of combined determination and light scattering,we studied the effect of organic matter on the surface charge properties of soil colloidal particles and condensation process of colloidal particles in water bodies.The results showed that the addition of organic matter significantly changed the surface charge properties of soils,because of the total charge number increased about 6.8％,the specific surface area decreased about 12.3％,and organic matter addition decreased the surface charge density of the particles and the surface potential.Further theoretical calculations showed that the addition of organic substance reduced the electrostatic repulsion between colloidal particles,which made the net gravity increase and aggregation of soil colloids become easier.The aggregation characteristics of soli colloids in the water bodies were studied by the method of light scattering,the results showed that the critical coagulation concentration (CCC) was 91.6 mmol/L before removing organic matter,and it was 139.3 mmol/L after organic matter was removed,and the difference betweent these two values was significant.The critical surface potentials for colloidal particle dispersive or aggregate were both about-150 mV at the corresponding concentrations.And the above concentrations were the critical concentrations that net gravitational attraction appeared between particles.The effect of organic matter on the aggregation characteristics of colloidal particles in water bodies was mainly through changing surface properties and the corresponding interactions of particles.关键词
三峡库区/有机质/净作用力/稳定性/临界聚沉浓度Key words
Three Gorge Reservoir Region/organic matter/net pressure/stability/the critical coagulation concentration分类
资源环境引用本文复制引用
丁武泉,何家洪,刘新敏,胡斐南,田锐,李航,朱华玲..有机质对三峡库区水体中土壤胶体颗粒凝聚影响机制研究[J].水土保持学报,2017,31(4):166-171,6.基金项目
国家自然科学基金项目(41101223,41501240) （41101223,41501240）
重庆市自然科学基金项目(cstc2014jcyjA80031,cstc2015jcyjA80015) （cstc2014jcyjA80031,cstc2015jcyjA80015）
重庆市教委科技项目(KJ1501115) （KJ1501115）
重庆市大学生创新性训练计划项目(201410642005) （201410642005）
