Simultaneous Spectrophotometric Determination of Rare-Earth and Transition Elements Using Partial Least-Squares (PLS) Multivariate Calibration |
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| Authors: | J. M. Camiña R. E. Ferreyra J. M. Luco E. Marchevsky |
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| Affiliation: | (1) Department of Chemistry, Faculty of Exact and Natural Sciences, National University of La Pampa, Argentina;(2) Food Laboratory, Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis, Argentina;(3) Department of Analytical Chemistry, Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis, P.O. Box 375, 5700 San Luis, Argentina |
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| Abstract: | A spectrophotometric method for the simultaneous determination of rare-earth and transition elements in synthetic superconductors, [(La1 – xEux)1.82Sr0.18CuO4], by the use of 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) as chelating agent was developed. The influence of chemical variables affecting the reaction was studied. A partial least-squares (PLS) multivariate calibration procedure was used to assess the data obtained from several calibration solutions measured over the wavelengths range 400–700 nm. The concentration range for Cu was (1–12) × 10–6 mol/L, while the range for the rare-earth elements La and Eu was (2–8) × 10–6 mol/L. The relative errors in the determinations were less than 5% in most cases. |
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