新稀土总量显色剂对乙酰基偶氮氯膦的合成及分析应用

Synthesis and Analytical Applications of p-Acetylchlorophosphonazo as a New Chromogenic Reagent for Total Rare Earths

本文报道了新显色剂对乙酰基偶氮氯膦的合成及其分析性能的详细研究。该试剂在实验条件下可使15种稀土离子的吸光度非常接近,且不受组成与配比的不同的影响,是优良的稀土总量显色剂。用于钢铁中稀土总量的测定获得满意的结果。

The synthesis and analytical applications of p-acetylchlorophosphonazo(CPApA)are described. Under the experimental condition, CPApA reacts with fifteen rare earth ions in 0. 04～0. 32mol/L of hydrochloric acid medium presenting almost identical absorbances at their isosbestic point(667nm). Different compositions of rare earth mixtures do not influence the result. The method has been used for the spectrophotometric determination of total rare earths in iron and steel with satisfactory results.