title: A graphical derivative approach to the photometric determination of lutetium and praseodymium in mixtures.
abstract: The reaction of lanthanides with 1,4-dihydroxyanthraquinone has been examined and optimum conditions have been found for the separate spectrophotometric determination of Lu and Pr. A graphical method based on use of first and second derivative spectra has been developed for analysis of binary mixtures of the two, in concentration ratios from 1:5 to 5:1. Linear calibration curves were obtained between 1 and 10 mug/ml.
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, The University, 29071-Malaga, Spain.
authors.forename: F G
authors.initials: FG
authors.lastname: Sanchez
authors.forename: M H
authors.initials: MH
authors.lastname: Lopez
authors.forename: J C
authors.initials: JC
authors.lastname: Gomez