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Microdetermination of vanadium by an automatic reaction-rate method

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Summary

An automatic spectrophotometric reaction-rate method for the microdetermination of vanadium(V) is described, based on catalysis of the hydrogen peroxide-iodide reaction. The time required for the reaction to produce a small fixed amount of triiodide is measured automatically and related directly to the vanadium concentration. The effect of reagent concentrations was studied and maximum tolerable amounts of interfering ions were determined.

Vanadium in the range 0,6 to 12 μg were determined with relative errors of about 2% and measurement times of about 15 to 120 seconds. The coefficient of variation for the determination of 1.5 μg V was 2.8%.

Zusammenfassung

Eine automatische spektrophotometrische Methode zur Mikrobestimmung von Vanadin(V) auf der Basis der Messung der Reaktionsgesch windigkeit wurde beschrieben. Die zur Bildung einer bestimmten kleinen Menge Trijodid durch Katalyse der Wasserstoffperoxid-Jodid-Reaktion benötigte Zeit wird automatisch gemessen. Sie ist direkt abhängig von der Vanadinkonzentration. Der Einfluß der Reagenzienkonzentration wurde untersucht und die maximale tolerierbare Menge störender Ionen bestimmt. 0,6 bis 12 μg Vanadin wurden mit einem relativen Fehler von etwa 2% bei Reaktionszeiten zwischen 15 und 120 Sekunden bestimmt. Der Variationskoeffizient bei der Bestimmung von 1,5 μg V beträgt 2,8%.

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Authors and Affiliations

  1. Laboratory of Analytical Chemistry, University of Athens, Athens 144, Greece

    T. P. Hadjiioannou & P. A. Siskos

Authors
  1. T. P. Hadjiioannou
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  2. P. A. Siskos
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Hadjiioannou, T.P., Siskos, P.A. Microdetermination of vanadium by an automatic reaction-rate method. Mikrochim Acta 63, 51–60 (1975). https://doi.org/10.1007/BF01271521

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  • DOI: https://doi.org/10.1007/BF01271521

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