土壤学报2013，Vol.50Issue(1)：89-95,7.
不同pH条件下黄壤胶体凝聚的动态光散射研究
DYNAMIC LIGHT SCATTERING OF AGGREGATION OF COLLOIDS IN YELLOW EARTH DIFFERENT IN pH
摘要
Abstract
Aggregation/Dispersion behavior of soil colloids is closely related to numerous environmental factors and regulated by surface charges of the colloids.Dynamics of the aggregation of variable charge colloids in yellow earths different in pH was studied with the dynamic light scattering technique.Results show that stability of the aggregation of soil colloids was strongly dependent upon pH.The aggregation of colloids induced by HNO3 or KOH,different in concentration would exhibit the characteristics of fast diffusion limited cluster aggregation (DLCA) or slow reaction limited cluster aggregation (RLCA).In the former,the aggregation induced by HNO3 was faster in average velocity and in variation than that by KOH,which suggests that the aggregation induced by neutralization of surface charge was faster than that by compression of double electron layers.The use of the pH corresponding to the turning point where average aggregation velocity changes pH in DLCA to estimate zero point of charge (ZPC) provides a new method for measuring ZPC in experiment.关键词
黄壤胶体/动态光散射/可变电荷表面/土壤pHKey words
Yellow earth colloids/ Dynamic light scattering/ Variable charge surface/ Soil pH分类
农业科技引用本文复制引用
李兵,李航,朱华玲,田锐,高晓丹..不同pH条件下黄壤胶体凝聚的动态光散射研究[J].土壤学报,2013,50(1):89-95,7.基金项目
国家自然科学基金项目(40971196)、973前期(2010CB134511)、重庆市自然科学基金项目(CSTC,2011BA7001)、西南大学基本科研业务费科研项目(XDJK2009C058)资助 （40971196）
