Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Journal of Soil and Water Conservation》 2017-04
Add to Favorite Get Latest Update

Effect of Organic Matter on Aggregation of Soil Colloidal Particles in Water Bodies of Three Gorge Reservoir Region

DING Wuquan;HE Jiahong;LIU Xinmin;HU Feinan;TIAN Rui;LI Hang;ZHU Hualing;Chongqing Key Laboratory of Environmental Materials & Remediation Technologies,Chongqing University of Arts and Science;Chongqing Key Laboratory of Soil Multi-scale Interfacial Process,Southwest University;  
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 91.6mmol/L before removing organic matter,and it was 139.3mmol/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.
【Key Words】: Three Gorge Reservoir Region organic matter net pressure stability the critical coagulation concentration
【Fund】: 国家自然科学基金项目(41101223 41501240);; 重庆市自然科学基金项目(cstc2014jcyjA80031 cstc2015jcyjA80015);; 重庆市教委科技项目(KJ1501115);; 重庆市大学生创新性训练计划项目(201410642005)
【CateGory Index】: S153.6
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved