5-Br-PADAP分光光度法测定稀土金属中微量钽

Spectrophotometric Determination of Micro Amounts of Tantalum with 5BrPADAP in Rare earth metals

采用５－Ｂｒ－ＰＡＤＡＰ分光光度法直接测定稀土金属中微量钽，探讨了最佳的测定条件。选用酒石酸体系，发现稀土金属元素０．１０００～０．３０００ｇ对Ｔａ－５－Ｂｒ－ＰＡＤＡＰ络合物显色反应无明显影响，不需预分离主体、方法简便、稳定性好，已用于Ｄｙ、Ｔｂ、Ｙｂ、Ｓｍ、Ｎｄ和Ｙ等稀土金属中微量钽的测定，测定范围为０．００５％～０．１０％Ｔａ２Ｏ５。

The optimum conditions of spectrophotmetric determination of micro amounts of tantalum with 5BrPADAP in rare earth metals have been studied.The experimental results show that 0.1～03g rare earth ions do not interfere with the determination.This method has the advantages of high stability,simplicity and rapidity.The detection range is 0.005%～0010% Ta2O5.The proposed method has been applied to the detection of tantalum in Dy,Tb,Yb,Sm,Nd and Y with satisfactory results.