Simultaneous determination of neodymium and erbium in rare earth mixture with 5,7-dibromo-8-hydroxyquinoline and TX-100 by third-derivative spectrophotometry |
| |
Authors: | Nai-Xing Wang Qing-Chang Wu Jun-Bo Shi Ping Qi |
| |
Institution: | (1) Department of Chemistry, Shandong University, 250100 Jinan, Peoples Republic of China;(2) Shandong Analysis and Test Center, 250014 Jinan, Peoples Republic of China |
| |
Abstract: | The absorption spectra of 4f electron transitions of the complexes of neodymium and erbium with 5,7-dibromo-8-hydroxyquinoline in the presence of octylphenol poly(ethyleneglycol)ether have been studied by normal and third-derivative spectrophotometry. The proposed method is free of interference of other rare earths. The calibration graphs were linear up to 18 g/ml of neodymium and 21 g/ml of erbium (in the final solution). The derivative molar absorptivities are 395 l.mol–1.cm–1 for neodymium and 3421.mol–1.cm–1 for erbium. The corresponding values of Sandell's sensitivity were 0.36 and 0.49 g.cm–1, respectively. The relative standard deviations evaluated from ten independent determinations of 2.5 g/ml of neodymium and erbium are 1.5 and 3.8% for neodymium and 1.8 and 4.1% for erbium in absence and presence of 70 g of lanthanum, respectively. The detection limits (signal to noise ratio=2) are 0.23 g/ml for neodymium and 0.30 g/ml for erbium. The method has been used for the determination of neodymium and erbium in mixed rare earths with satisfactory results. |
| |
Keywords: | neodymium erbium 5 7-dibromo-8-hydroxyquinoline rare earths determination derivative spectrophotometry |
本文献已被 SpringerLink 等数据库收录! |