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Absorption Spectra of the 4f Electron Transitions of the Praseodymium Complex with 1-Cyclopropyl-6-fluoro-1,4-dihydro-7-(4-ethyl-1-piperazinyl)-4-oxo-3-quinoline Carboxylic Acid Hydrochloride and Its Analytical Application

Absorption Spectra of the 4f Electron Transitions of the Praseodymium Complex with 1-Cyclopropyl-6-fluoro-1,4-dihydro-7-(4-ethyl-1-piperazinyl)-4-oxo-3-quinoline Carboxylic Acid Hydrochloride and Its Analytical Application

Authors :
Zhikun Si
Xiuqin Xu
Quanjie Men
Naixing Wang
Wei Jiang
Fuxiang Liu
Source :
Analytical Sciences. 17:1091-1094
Publication Year :
2001
Publisher :
Springer Science and Business Media LLC, 2001.

Abstract

The absorption spectra of the praseodymium complex with 1-cyclopropyl-6-fluoro-1,4-dihydro-7-(4-ethyl-1-piperazinyl)-4-oxo-3- quinoline carboxylic acid hydrochloride (NNFX) has been studied by normal and derivative spectrophotometry. The complex showed maximum absorption at 350 nm at pH 6.0. The stoichiometry of the Pr-NNFX complex was calculated by the molar ratio and continuous variation methods. The ratio of Pr to NNFX was 1:3. The absorption bands of the 4f electron transitions of the praseodymium complex with NNFX are enhanced markedly, especially the wavelength at 481 nm. Using the third-derivative spectrum, the calibration graph is linear over the range 2.5 x 10(-5)-3.5 x 10(-4) mol dm-3 for praseodymium. The detection limits (signal-to-noise ratio of 2) is 1.4 x 10(-6) mol dm-3. The relative standard deviation is 1.2% for 7.0 x 10(-5) mol dm-3 of praseodymium. A method for the direct determination of praseodymium in rare earth mixtures with good accuracy and selectivity is described.

Details

ISSN :
13482246 and 09106340
Volume :
17
Database :
OpenAIRE
Journal :
Analytical Sciences
Accession number :
edsair.doi.dedup.....0f6aff486d7e35acdc8b2f96d4880c7b
Full Text :
https://doi.org/10.2116/analsci.17.1091