title: 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.
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.
authors.affiliation: Department of Chemistry, Shandong University, Jinan, 250100, People's Republic of China.
authors.forename: N
authors.initials: N
authors.lastname: Wang
authors.forename: W
authors.initials: W
authors.lastname: Jiang
authors.forename: Z
authors.initials: Z
authors.lastname: Si
authors.forename: F
authors.initials: F
authors.lastname: Liu
authors.forename: Q
authors.initials: Q
authors.lastname: Men
authors.forename: X
authors.initials: X
authors.lastname: Xu