Absorption spectra of 4f electron transitions of neodymium and erbium complexes with ferron and diethylamine. Determination of neodymium and erbium in rare earth mixtures by third-derivative spectrophotometry
✍ Scribed by Naixing Wang; Weian Liang; Shifu Zhou; Ping Qi
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 390 KB
- Volume
- 262
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
The absorption spectra of 4f electron transItIons of complexes of ferron (5-sulpho-7-mdoqumohn-8-01) with neodymmm and e&mm m the presence. of dlethylamme were measured Their molar absorptMy at the manmum absorption bands was about 7 5 (at 574 2 nm) times greater for neodymmm and 10 8 (at 519 8 nm) times greater for e&urn than those m the absence of the complexmg agents Use of thlrddenvatwe spectra both eliminates the Interference of other lanthamdes and mcreaaes the sensltlvltles for neodymium and erbmm Beer's law was obeyed from 0 to 13 pg ml-' The relative standard devlatlons for the deterrnmatlon of 7 2 pg ml-' of neodymmm and 8 3 pg ml-' of erbmm (n = 7) are 1 3% and 1 5%, respectively The detectlon lumts (agnal-to-noise ratlo = 2) are 0 3 pg ml-' for neodynuum and 0 4 cg ml-' for ertnum A method for the direct determmatlon of neodynnum and erbmm m rare earth mixtures with good accuracy and selectMy IS proposed