鲁米诺化学发光熄灭法测定稀土镧的研究

The Quenching of Rare Earth La(Ⅲ) Ion in the Chemiluminescence System of Luminol H 2O 2 Cr(Ⅲ)

本文研究了稀土Ｌａ（Ⅲ）对Ｌｕｍｉｎｏｌ－Ｈ２Ｏ２－Ｃｒ（Ⅲ）化学发光体系的熄灭效应，在此基础上建立了稀土镧的流动注射化学发光分析法，方法的检出限为４×１０－８ｍｏｌ／Ｌ；对于２×１０－７ｍｏｌ／Ｌ稀土镧标准溶液测定的相对标准偏差为３．０％（ｎ＝１１）；线性范围为１．０×１０－７—１．０×１０－４ｍｏｌ／Ｌ；相关系数大于０．９９８４，该法用于合成样品分析，结果满意。

In this paper, a new chemiluminescence analytical method for the determination of rare earth La(Ⅲ) ion is presented. It is based on the qucnching of La(Ⅲ) ion in the chemiluminescence system of Luminol H 2O 2 Cr(Ⅲ). The detection limit is 4×10 -8 mol/L La. The linear range is 1.0 ×10 -7 - 1.0 ×10 -4 mol/L La, The relative standard deviation is less than 3% (for 2×10 -7 mol/L La n =11). The method developed has been applied to the determination of La(Ⅲ) in synthetic samples.