巩县风化煤黄腐酸与Co(Ⅱ)的配合物稳定常数的测定  

DETERMINATION OF STABILITY CONSTANTS OF THE Co(Ⅱ) COMPLEXES WITH WEATHERED COAL FULVIC ACID

作　　者：董文明[1] 杜金洲[1] 陶祖贻[1] 张红庆[2] 王旭东[2] 游志军 李伟娟[2] 

机构地区：[1]兰州大学化学化工学院,甘肃兰州730000 [2]中国辐射防护研究院,山西太原030006

出　　处：《核化学与放射化学》2000年第1期8-13,共6页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金资助项目!(2 96 710 16 );核工业科学基金资助项目!(H7196PY10 3)

摘　　要：以6 0 Co作示踪剂 ,用舒伯特 (Schubert)法、斯蒂文森 (Stevenson)法以及改进的舒伯特法 ,测定了河南巩县风化煤黄腐酸与Co(Ⅱ )在不同离子强度下生成的配合物稳定常数 ,并对不同方法所测得的稳定常数值进行了比较。实验结果表明 ,随着溶液中离子强度的增大 ,有形成多核配合物的趋势 ;在不同离子强度下可生成配位比分别为 1∶1和 2∶1的两种配合物。The stability constants of Co(Ⅱ) complexes with weathered coal fulvic acid are determined by both Schubert method and Stevenson method at pH=5.3±0.2, I =0.001～1.0 mol/kg and (30±1)℃. The modified Schubert method is also used to estimate the stability constants of Co(Ⅱ) complexes with the fulvic acid. It is shown that the trend of forming polynuclei complexes of Co(Ⅱ) fulvic acid increases with increasing ionic strength in the solution and that 1∶1 and 2∶1 type complexes, respectively, are formed at different ionic strength. A comparison between the values of lg β obtained by different methods is made.

关 键 词：黄腐酸 稳定常数 离子交换 钴配合物 

分 类 号：O614.812[理学—无机化学] O636.9[理学—化学]