Simultaneos Spectrophotometric Determination of Rare Earth and Transition Elements Using Partial Least-Squares (PLS) Multivariate Calibration

J. M. CAMIÑA; R. E. FERREYRA; E. J. MARCHEVSKY; J. M. LUCO

JOURNAL OF ANALYTICAL CHEMISTRY

MAIK NAUKA/INTERPERIODICA/SPRINGER

Lugar: Kiev; Año: 2001 vol. 56 p. 25 - 30

1061-9348

A spectrophotometric method for the simultaneous determination of rare-earth and transition elements in synthetic superconductors, 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) 10-6mol/L. The relative errors in the determinations were less than 5% in most cases.