配位滴定法测定钴含量的实验探索  

Experimental Exploration on Determination of Cobalt Content by Coordination Titration

作　　者：雷琴 马双 彭传友 王芳 曹春梅 Lei Qin;Ma Shuang;Peng Chuanyou;Wang Fang;Cao Chunmei(Chongqing Chemical Industry Vocational College,Chongqing 401220,China)

机构地区：[1]重庆化工职业学院,重庆401220

出　　处：《山东化工》2023年第3期156-159,共4页Shandong Chemical Industry

摘　　要：配位滴定法,用EDTA滴定样品中钴的含量,在实验过程中,发现加入指示剂的节点不明确,终点颜色的突变不明显,使测定精密度降低,为了解决该问题进行实验探索。最终通过调节溶液pH值,观察滴定中溶液颜色的变化来把控指示剂加入时间。In coordination titration,EDTA is used to titrate the content of cobalt in the sample.In the process of experiment,it is found that the node of adding indicator is not clear,and the mutation of end-point color is not obvious,which reduces the determination precision.In order to solve this problem,experimental exploration is carried out.Finally,by adjusting the pH value of the solution and observing the change of the color of the solution in the titration,the time of adding the indicator is controlled.

关 键 词：配位滴定法 钴含量 PH值 

分 类 号：O655.2[理学—分析化学]