Garcia Rodriguez A M, Garcia de Torres A, Cano Pavon J M, Bosch Ojeda C
Department of Analytical Chemistry, Faculty of Sciences, University of Malaga, E-29071, Malaga, Spain.
Talanta. 1998 Oct;47(2):463-70. doi: 10.1016/s0039-9140(98)00157-x.
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.
