摘要
在pH 5 .5溶液中 ,有溴化十六烷基三甲基铵存在下 ,钪 (Ⅲ )与乳酸及埃络青R(ECR)形成胶束混酸络合物 ,该络合物最大吸收波长为 5 90nm ,表观摩尔吸光系数ε =1.2 6× 10 5L·mol- 1·cm- 1。络合物的组成为钪 (Ⅲ )∶乳酸∶ECR =1∶1∶2。由于乳酸的存在 ,显色体系的灵敏度、选择性和稳定性都得到提高。用 1 苯基 3 甲基 4 苯甲酰基吡唑啉酮 5 (PMBP)分离干扰组分后 ,可测定钨矿及其浸出渣中的微量钪 。
It was found that in a hexamine buffer solution of pH 5.5, lactic acid (LA) acted as an assisting ligand in the color reaction of Sc(Ⅲ) and ECR in the presence of CTMAB, thus forming a mixed micellar ligand complex. The absorption maxina was found to lie at 590nm instead of 585nm in the absence of lactic acid. The apparent molar absorptivity achieved a value of 1.26×10 5L·mol -1·cm -1. The mole ratio of the mixed micellar ligand complex was found to be Sc(Ⅲ)∶LA∶ECR=1∶1∶2. Furthermore the sensitivity, selectivity and stability of the color reaction system were remarkably improved due to the presence of lactic acid. After a separation by extraction with PMBP, the above mentioned method has been applied to the determination of microamounts of scandium in tungsten ore and its extraction slags.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2002年第10期497-499,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
