钇镧共存时利用一阶导数分光光度法进行钇的测定

Using First Derivative Spectrophotometric Method to Determine Yttrium Contents When Lanthunium and Yttrium Co-exist

摘要:

在稀土元素钇、镧共存时 ,以变色酸双偶氮类试剂为显色剂 ,在 pH为 2的介质中 ,加入乙醇 ,利用溶剂化效应 ,提高Y ,La络合物性质的差异 ,从而可在一阶导数光谱上消除La的影响而直接测定Y。测定波长 675nm ,摩尔吸光系数ε为 1 .73× 1 0 4 L·mol- 1 ·cm- 1 ,九次测定变异系数为 1 .92 % ,Y3+含量在 0～ 40 0 μg/L范围内符合比耳定律 ,该方法快速简便 ,适合于矿物原料、钢铁、合金中钇的测定。

Abstract:

When lanthanium and yttrium co-exist, yttrium contents can be determined by eliminating lanthanium from first derivative spectrum. Its major points are as following:off-color acid double azo used as reagent;ethanol added to PH value 2 medium to produce solvation effect and to enhance differentiation of Y and La chelate. The measured wave length in this experiment is 675nm;molar absorptivity (ε) 1.73×10 4;variation coefficient (9 times) 1.92%. The contents of Y 3+ ratio from 0 to 400 μg in 25ml solutio...