Individual and sequential flow injection spectrophotometric determination of vanadium(V) and titanium(IV)

Summary Methods for the individual and sequential flow injection spectrophotometric determination of vanadium(V) and titanium(IV) are proposed, based on the formation of peroxo complexes. The detection limits are 1.0 × 10^–5 mol/l V (120 l) and 2.5 × 10^–6 mol/l Ti (80 l). A cation exchange resin mini-column is incorporated on-line into the vanadium manifold to remove the titanium complex and allow the vanadium to be determined selectively. A normal injection valve is used for the individual determinations, but it is modified for determination of V(V)/–Ti(IV) mixtures in order to introduce two samples sequentially into the reagent stream. One passes through a cation exchanger minicolumn, the other through an empty column, before reaching the detector. The former allows V alone to be measured, the latter V+Ti.

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Individuelle und sequentielle spektralphotometrische Fließinjektionsbestimmung von Vanadium(V) und Titan(IV)

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Dedicated to Prof. Dr. G. Tölg on the occasion of his 60th birthday