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ABSTRACT
A method for simultaneous kinetic analysis of Fe(II) and Fe(III) using partial least squares (PLS) and principal component regression (PCR) calibration methods is proposed. The method is based on the inductive effects of Fe(II) and Fe(III) on the chromium(VI)–iodide–starch reaction in acidic medium. The calibration graphs are linear in the range of 20–500 and 20–520 ppm for Fe(II) and Fe(III), respectively. A series of synthetic and spiked real matrix solutions containing different concentrations of Fe(II) and Fe(III) were used to check the prediction ability of the PLS and PCR models. The number of significant factors for Fe(II) and Fe(III) are: 5 and 7 for PLS and 3 and 3 for PCR, respectively. RMSD parameter for Fe(II) and Fe(III) using PLS and PCR methods are 1.9935, 1.5869 and 24.3022, 48.9117, respectively. The effect of several parameters and diverse ion effect were also studied.
