title: Simultaneous determination of iron, cobalt, nickel and copper by UV-visible spectrophotometry with multivariate calibration.
abstract: A method for the simultaneous spectrophotometric determination of the divalent ions of iron, cobalt, nickel and copper based on the formation of their complexes with 1,5-bis(di-2-pyridylmethylene) thiocarbonohydrazide (DPTH) is proposed. The resolution of quaternary mixtures of these metallic ions was accomplished by several chemometric approaches. A comparative study of the results obtained for simultaneous determinations in mixture by using principal component regression (PCR) and partial least-squares regression (PLS-1 and PLS-2) for absorbance, first-derivative and second-derivative data is presented. In general, the best recovery values are obtained by the PLS-2 method for absorbance data. This procedure allows the simultaneous determination of the cited ions in alloys and biological materials Good reliability of the determination was proved.
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, University of Malaga, E-29071, Malaga, Spain.
authors.forename: A M
authors.initials: AM
authors.lastname: Garcia Rodriguez
authors.forename: A
authors.initials: A
authors.lastname: Garcia de Torres
authors.forename: J M
authors.initials: JM
authors.lastname: Cano Pavon
authors.forename: C
authors.initials: C
authors.lastname: Bosch Ojeda