title: Extraction and sensitive spectrophotometric determination of ytterbium with 2-(3,5-dichloro-2-pyridylazo)-5-dimethylaminophenol.
abstract: The operating conditions for the absorptiometric determination of Yb(III) with the reagent 2-(3,5-dichloro-2-pyridylazo)-5-dimethylaminophenol (3,5-diClDMPAP) by a liquid-liquid extraction technique are presented. The complex yields a molar absorptivity of 1.54 x 10(5)l.mole(-1).cm(-1) (lambda(max) = 588 nm) and an optimum concentration range of 0.025-1.360n mg/l., at pH = 10. The method developed has been applied to the determination of Yb(III) in synthetic and concrete mixtures.
authors.affiliation: Department of Analytical Chemistry (Dr Carlos B. Marone) Faculty of Chemistry, Biochemistry and Pharmacy, University of San Luis, Argentina.
authors.forename: L
authors.initials: L
authors.lastname: Fernandez
authors.forename: R
authors.initials: R
authors.lastname: Olsina