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

✍ Scribed by Simeonova, Zhivka ;Gavazov, Kiril ;Alexandrov, Alexander

• Book ID: 111487893
• Publisher: Walter de Gruyter GmbH
• Year: 2006
• Tongue: English
• Weight: 203 KB
• Volume: 4
• Category: Article
• ISSN: 2391-5420
• DOI: 10.2478/s11532-006-0011-7

✦ Synopsis

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.