Amg. Rodriguez et al., SIMULTANEOUS DETERMINATION OF IRON, COBALT, NICKEL AND COPPER BY UV-VISIBLE SPECTROPHOTOMETRY WITH MULTIVARIATE CALIBRATION, Talanta, 47(2), 1998, pp. 463-470
A method for the simultaneous spectrophotometric determination of the
divalent ions of iron, cobalt, nickel and copper based on the formatio
n of their complexes with I,5-bis(di-2-pyridylmethylene) thiocarbonohy
drazide (DPTH) is proposed. The resolution of quaternary mixtures of t
hese metallic ions was accomplished by several chemometric approaches.
A comparative study of the results obtained for simultaneous determin
ations in mixture by using principal component regression (PCR) and pa
rtial least-squares regression (PLS-1 and PLS-2) for absorbance, first
-derivative and second-derivative data is presented. In general, the b
est recovery values are obtained by the PLS-2 method for absorbance da
ta. This procedure allows the simultaneous determination of the cited
ions in alloys and biological materials Good reliability of the determ
ination was proved. (C) 1998 Elsevier Science B.V. All rights reserved
.