Extraction-spectrophotometric study on the vanadium(V)-2,3-dihydroxynaphthalene — iodonitrotetrazolium chloride — water — chloroform system and its analytical application |
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Authors: | Zhivka J Simeonova Kiril B Gavazov Alexander V Alexandrov |
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Institution: | (1) Department of General and Inorganic Chemistry, Plovdiv University, 4000 Plovdiv, Bulgaria |
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Abstract: | The formation of a new ternary ion-associate complex of vanadium(V) with 2,3-dihydroxynaphthalene and iodonitrotetrazolium
chloride with a composition ratio of 1:2:1 is reported. The complex is quantitatively extracted from water into chloroform.
The molar absorptivity (ɛ) of the extract at λ
max=340 nm is 2.5 × 104 dm3/mol cm, and Beer’s law is obeyed for concentrations ranging from 0.1 to 0.9 μg/cm3 V(V). The following constants are determined: the extraction constant, the association constant, the distribution constant,
and the recovery factor. The effects of foreign ions and reagents are studied. A selective and sensitive method is developed
for determination of vanadium in steels. |
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Keywords: | Vanadium(V) ion-associate complex 2 3-dihydroxynaphthalene iodonitrotetrazolium chloride extraction-spectrophotometric determination steel |
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