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Abstract

This paper deals with nonconventional approaches to multicomponent spectrophotometric analysis consisting of (i) simultaneous or consecutive addition of several nonselective reagents in the multicomponent determination of metal ions, and (ii) the use of absorbance data which have been measured at different pH values or in different experimental conditions and subsequently combined into a single data set, evaluated by the partial least squares method. The following multicomponent mixtures of metal ions with reagents were examined: Co²⁺ and Fe³⁺ with nitroso-R-salt and 1,10-phenanthroline; Co²⁺, Cu²⁺ and Fe³⁺ with nitroso-R-salt and zincon; Co²⁺, Cu²⁺ and Zn²⁺ with nitroso- R-salt and zincon; and Cu²⁺, Zn²⁺ and Ni²⁺ with zincon and PAR. The average relative error of determination was 2% (two metal ions) and 5% (three metal ions). Cu²⁺, Zn²⁺ and Ni²⁺ were also quantitated in ALPAKA alloy with relative errors of 4 - 9%.