对氯偶氮氯膦光度法测定钢铁中的稀土总量

Spectrophotometric Determination of Total Rare Earths in Iron and Steel with Chlorophosphonazo-p-Cl

本文详细研究了对氯偶氮氯膦用作稀土总量显色剂的条件,利用反应酸度的选择,显色时间的控制以及吸收光谱等吸收点的选用,使各单一稀土的吸光度尽量接近,这样可避免因稀土配分的不同而带来的误差。该试剂用于钢铁中稀土总量的测定得到满意结果。

Chlorophosphonazo-p-Cl(CPApC) reacts with rare earths to form color-complexes,in 0.16M hydrochloric acid solution. An isosbestic point at 665nm was found among the absorption spectra of fifteen RE-CPApC complexes. At this wavelength, the total RE can be determined accurately. A spectrophotometric method has been developed for the determination of total RE in iron and steel using EDTA as a masking reagent for iron,