不同来源腐殖酸对铜吸附量和吸附机制的研究  

Adsorption and Desorption Pattern of Copper by Humic Acids from Three Different Sources

作　　者：陈盈[1] 颜丽[2] 关连珠[2] 王冲[2] 董旭 张旭东[1] 

机构地区：[1]中国科学院沈阳应用生态研究所陆地生态过程重点实验室 [2]沈阳农业大学土地与环境学院,辽宁沈阳110161 [3]辽宁省土壤肥料总站,辽宁沈阳110034

出　　处：《土壤通报》2006年第3期479-481,共3页Chinese Journal of Soil Science

基　　金：自然科学基金重点项目(40535028);中国科学院知识创新工程重要方向项目(KZCX3-SW-433)资助

摘　　要：本研究从三种供试材料:草炭、褐煤和风化煤中提取腐殖酸,采用NH4OAc和EDTA两种解吸剂,研究三种来源腐殖酸对Cu2+的吸附能力和吸附机制。研究结果表明:三种来源腐殖酸对Cu2+的吸附在吸附量上没有明显差异,但吸附机制却并不完全相同。三种来源腐殖酸对Cu2+的吸附均主要通过离子交换和络合(或螯合)作用,其中,草炭和褐煤提取的腐殖酸的离子交换作用显著大于风化煤提取的腐殖酸,而风化煤提取的腐殖酸的络合(或螯合)作用则明显大于草炭和褐煤提取的腐殖酸。Three types of humic acids from different sources, i. e. peat, lignite and weathering coal （ named as C - HA, H -HA and F- HA, respectively）, were extracted and the adsorption and desorption pattern of Cu by the three hurnic acids was investigated. The results showed that Cu^2＋ adsorption capacity of three types of humic acids were not significantly different. Desorption study revealed that the three types of humic acids adsorbed Cu^2＋ mainly through ion exchange and complexation, but the three acids behaved differently. Among them, the ion exchange ability of C - HA and H - HA was markedly stronger than that of F - HA, while, the complexation ability of F - HA was greater than that of C - HA and H - HA.

关 键 词：腐殖酸 铜 吸附 解吸 

分 类 号：S153[农业科学—土壤学]