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在含乙醇≥45％的0.015N-0.60N的硫酸溶液中,偶氮氯瞵Ⅲ与稀土元素形成灵敏的高次络合物。它们的最大吸收位于655nm,摩尔吸光系数视稀土元素的不同分别为1.14×10~5-1.92×10~5,相当于水溶液灵敏度的2～3倍。用连续变化法和平衡移动法确定络合物的组成比是RE:CPAⅢ=1:3,方法有良好的选择性,在草酸或EDTA等掩蔽剂存在下,可以直接、快速测定钢铁中微量稀土元素。
In 0.015N-0.60N sulfuric acid solution containing ≥45% ethanol, azobis (Ⅲ) forms a sensitive high order complex with rare earth elements. Their maximum absorption at 655nm, molar extinction coefficient depending on the rare earth elements were 1.14 × 10 ~ 5-1.92 × 10 ~ 5, equivalent to 2 to 3 times the sensitivity of aqueous solution. The composition ratio of the complex is determined by the continuous changing method and equilibrium shift method. RE: CPAⅢ = 1: 3, the method has good selectivity. In the presence of masking agent such as oxalic acid or EDTA, the trace rare earth element.