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  1. 1 Open Chemistry

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  1. 1 2006

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  1. 1 Alexandrov A.

  2. 1 Gavazov K.

  3. 1 Simeonova Z.

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Extraction-spectrophotometric study on the vanadium(V)-2,3-dihydroxynaphthalene - iodonitrotetrazolium chloride - water - chloroform system and its analytical application

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Simeonova Z., Gavazov K., Alexandrov A.
Open Chemistry
|
2006
|
vol. 4
|
issue 2
258-265
EN
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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