Citation: ai Xing WANG, Ping QI. DIRECT DETERMINATION OF NEODYMIUM AND ERBIUM IN RARE EARTH MIXTURE BY DERIVATIVE SPECTROPHOTOMETRY[J]. Chinese Chemical Letters, ;1991, 2(12): 949-952. shu

DIRECT DETERMINATION OF NEODYMIUM AND ERBIUM IN RARE EARTH MIXTURE BY DERIVATIVE SPECTROPHOTOMETRY

ai Xing WANG ^a,b ,
Ping QI ^b

a. Department of Chemistry, Shandong University, Jinan, 250100;
b. Shandong Analysis and Test Center, Jinan, Shandong

Received Date: 15 August 1991

The absorption spectra of 4f electron transitions of the complexes of neodymium and erbium with 8-hydroxyquinoline-5-sulphonic acid in the presence of diethylamine and ethanol have been measured by normal and third-derivative spectrophotometry. Their molar absorptivities are 70.7 l.mol^-1.cm^-1 for Nd and 62.5 l.mol^-1.cm^-1 for Er. They are 7.6 times and 14.9 times greater than those of corresponding chlorides, respectively. Use of the third-derivative spectra both eliminates the interference of Ce(Ⅳ) and increases the sensitivity for Nd and Er. Beer,s Law was obeyed from 0-10 ug/ml of Nd and Er. The method has been applied to the determination of neodymium and erbium in rare earth mixtures.
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