title: Simultaneous spectrophotometric determination of erbium and praseodymium with 1-(2-pyridylazo)-2-naphthol in the presence of octylphenol poly(ethyleneglycol) ether (TX-100).
abstract: The optimum conditions for formation of Er-PAN and Pr-PAN complexes in micelles of TX-100 are described, and methods proposed for spectrophotometric determination of the two elements. The molar absorptivities were 5.0 x 10(4)1.mole(-1).cm(-1) for Er and 4.6 x 10(4)1.mole-1.cm(-1) for Pr. A simple method is proposed for simultaneous determination of Er and Pr without previous separation, based on a micellar masking process.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Salamanca, Salamanca, Spain.
authors.forename: J H
authors.initials: JH
authors.lastname: Mendez
authors.forename: B M
authors.initials: BM
authors.lastname: Cordero
authors.forename: J L
authors.initials: JL
authors.lastname: Pavon