不同来源腐殖酸与Mn^2＋和Zn^2＋络合稳定常数的确定  

Stability constants of complication of Mn^(2+) and Zn^(2+) with humic acids from three different sources

作　　者：陈盈[1] 张满利 张威[2] 何红波[2] 关连珠[3] 颜丽[3] 

机构地区：[1]辽宁省稻作研究所,辽宁沈阳110101 [2]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,辽宁沈阳110016 [3]沈阳农业大学土地与环境学院,辽宁沈阳110161

出　　处：《辽宁工程技术大学学报（自然科学版）》2008年第3期478-480,共3页Journal of Liaoning Technical University (Natural Science)

基　　金：农业部农业结构调整重大技术研究专项基金资助项目(06-01-05B)

摘　　要：以分别来源于草碳、褐煤和风化煤的腐殖酸为供试材料,采用离子交换平衡法研究了不同腐殖化程度的腐殖酸与Mn2+和Zn2+的络合稳定常数,并探讨了环境pH值对络合稳定常数的影响。结果表明,三种来源腐殖酸与Mn2+和Zn2+的络合稳定常数受pH值的显著影响,且均以pH5.5时较高。风化煤来源腐殖酸与金属离子形成的络合物的稳定性高于草碳来源腐殖酸和褐煤来源腐殖酸。说明腐殖酸的腐殖化程度越高,与金属离子形成络合物的稳定程度越大。Three types of humic acids, i.e. peat, lignite and weathering coal （named as C-HA, H-HA and F-HA, respectively）, were extracted and stability constants of Mn^2＋ and Zn^2＋ with the three humic acids were investigated The results show that the stability constants were greatly affected by pH value, and, the higher stability constants were found when pH value was 5.5. The stability constants of F-HA with the metals were higher than those of C-HA and H-HA. The results suggest that the more humified humic acids, the more stability of the complication with metal irons.

关 键 词：腐殖酸 金属离子 稳定常数 

分 类 号：S153[农业科学—土壤学]