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Flotation-Spectrophotometric Determination of Vanadium with 3,5-Dinitrocatechol and Rhodamine B

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Abstract

A new method of flotation separation and preconcentration of vanadium traces is described. The ion-associate formed by the anionic vanadium(V)-3,5-dinitrocatechol complex and Rhodamine B is floated with cyclohexane. The separated and washed compound readily dissolves in acetone, giving an intensely coloured solution which forms the basis for a sensitive spectrophotometric determination of vanadium. The molar absorptivity is 2.1×105 l mol-1 cm-1 at 555 nm and the detection limit Is 3 ng/ml. Beer’s law is obeyed up to a vanadium concentration of 0.3 μg/ml. The composition of the floated compound was established. Its proposed formula is [(RB)2]-[VO(OH)(DNC)2]. EDTA, oxalate and some metals interfere. The method becomes specific for vanadium after a preliminary extraction of the metal as its N-benzoyl-N-phenylhydroxylamine (BPHA) chelate from a HCl-HF medium. The method was applied to the vanadium determination (0.2-9 ppm) in some vegetables.

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Authors and Affiliations

  1. Department of Analytical Chemistry, Technical University, ul. Noakowskiego 3, 00-664, Warsaw, Poland

    Ryszard Lobiński & Zygmunt Marczenko

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  1. Ryszard Lobiński
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  2. Zygmunt Marczenko
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Lobiński, R., Marczenko, Z. Flotation-Spectrophotometric Determination of Vanadium with 3,5-Dinitrocatechol and Rhodamine B. ANAL. SCI. 4, 629–635 (1988). https://doi.org/10.2116/analsci.4.629

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  • DOI: https://doi.org/10.2116/analsci.4.629

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