稀土一漂蓝6B络合吸附波测定稀土钢中的微量稀土

Determination of Trace Rare Earth Elements in Rare Earth-Steel by Adsorptive Complex Wave of Rare-earth with Eriochrome AzuralB

研究了在ＰＨ７．０－８．０的 ＮＨ３－ＮＨ４ Ａｃ介质中，稀土与漂蓝 ６Ｂ的络合物极谱波，波高与Ｌａ３＋离子浓度在１．０×１０－７－１．０×１０－６ｍｏｌ／Ｌ范围内成线性关系。用于钢铁中微量稀土测定，结果满意。

<Abstracts>In this paper, the adsorptive complex wave of rare - earth with eriochrome azural B(ECAB)were investi- gated. In NH3 - NH4A buffer solution at PH7 .0 - 8 .0, the complex Of rare - earth with ECAB exhibits a well - de- fined wave in singlesweep polarogrphy, the derivative peak potential is - 0. 950V (V. SCE), this wave has been proved to be an adsorptive complex wave. The wave height of proportional and the concentration of La3+ in the range Of 1 .0× 10 -7, - 1 .0× 10- 6 mol/L. The method has been applied to the determination of trace rare - earth elements in rare - earth steel with satisfacfory results.