Original scientific paper

Application of 1-(4-Tolyl)-2-methyl-3-hydroxy-4-pyridone to the Spectrophotometric Determination of Vanadium(V)

B. Tamhina ; Laboratory of Analytical Chemistry, Faculty of Science, University o)' Zagreb, 41000 Zagreb, Strossmayerov trg 14, Croatia, Yugoslavia
V. Vojković ; Laboratory of Analytical Chemistry, Faculty of Science, University o)' Zagreb, 41000 Zagreb, Strossmayerov trg 14, Croatia, Yugoslavia
M. J. Herak ; Laboratory of Analytical Chemistry, Faculty of Science, University o)' Zagreb, 41000 Zagreb, Strossmayerov trg 14, Croatia, Yugoslavia

Abstract

The application of 1-(4-tolyl)-2-methyl-3-hydroxy-4- (HY) for the spectrophotometric determination of V(V) by extraction
into chloroform was ~nvestigated. lit was found that depending on
the extraotion condiltions three types of complexes are formed.
At pH 1.2-2.5 an orange complex of the composition V02Y ·HY
with a maximum absorption at 500 ([]Jm is formed. However, at
1.2-2.0 M hydrogen ion concentration and in .the presence of an
excess of chloride ions a blue complex V02Cl(HY)2 with maximum
absorption at 625 nm was found. In the presence of an excess of
perchlorate i01I1s and at 0.2-1.0 M hydrogen ion concentration a
blue complex V02Cl04(HY)3 with maximum absorption at 605 was
found. Solutions of these complexes show great stability and they
follow the Lambert-Beer's law. Procedures for the determination
of vanadium at either 500 or 625 nm are very simple fast and
selective. The compositions of the complexes have been characterized
m chloiroform solution. They were also isolated in crystalline
form and iinderntified by elemental analysis and infrared spectroscopy.

Keywords

Hrčak ID:

196481

URI

https://hrcak.srce.hr/196481

Publication date:

30.4.1976.

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