pH值对胡敏酸、富里酸与Cd^(2+)络合反应的影响  

Effect of pH on the Complex Reaction of Humic acid,Fulvic Acid with Cd^(2+)

作　　者：夏扎旦·阿不力克木[1] 艾克拜尔·伊拉洪[1] 吐尔逊·吐尔洪[1] 阿大来提·奥布力[1] 

机构地区：[1]新疆农业大学草业与环境科学学院,乌鲁木齐830052

出　　处：《新疆农业科学》2012年第9期1701-1706,共6页Xinjiang Agricultural Sciences

基　　金：国家自然科学基金(40861010);2011年度国家外专局教科文卫引智项目(W2011191);土壤学自治区重点学科

摘　　要：【目的】探讨pH值对新疆典型草原黑钙土中胡敏酸(HA)、富里酸(FA)与Cd离子络合物稳定性的影响。【方法】采用Schuber提出的离子交换平衡法测定腐殖质-Cd复合体的络合稳定常数和配位数。【结果】在不同pH值条件下,HA与Cd结合形成的复合体络合稳定常数在1.45～7.88,而FA与Cd的络合稳定常数在1.29～5.53。络合稳定常数和配位数随着pH值的增大而增大,但是HA-Cd的络合稳定常数和配位数均比FA-Cd的络合稳定常数和配位数高。【结论】pH值显著地影响HA-Cd、FA-Cd的络合稳定常数和配位数。在不同pH值条件下,HA-Cd的络合稳定常数、配位数以及吸附率均大于FA-Cd的络合稳定常数、配位数以及吸附率。[ Objective ] The project aims to study the effect of pH on the stability of humic acid - Cd, fulvic acid - Cd complexes. The humic acid and fulvic acid are extracted from the typical grassland chernozem in Xinjiang. [Method] The ion -exchange equilibrium method was used presented by Schuber, to determine the stability constants and coordination number of humic acid - Cd complexes. [ Result ] In different pH conditions, the stability constants of the complex formed by HA and Cd is 1.45 - 7.88, while the FA - Cd complex is 1.29 -5.53. The stability constants and coordination number magnify with the magnifying of pH, but the stability constants and coordination number of HA -Cd are higher than that of FA -Cd. [ Conclusion] pH markedly influence the stability constants and coordination number of HA - Cd and FA - Cd. In different pH conditions, the stability constants, coordination number and adsorption rate of HA - Cd are all higher than that of FA - Cd.

关 键 词：PH值 腐植酸 CD 络合稳定常数 配位数 

分 类 号：S153.1[农业科学—土壤学]