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

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。

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 solution, which is in accordance with law Beer. The method is easy and rapid to determine yttrium content and suitable to analyze it in iron and steel, and alloy.