The extraction of the tungsten(VI)-Pyrocatechol Violet complex with tridodecylethylammonium bromide.

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  • Shijo Yoshio
    Department of Environmental Chemistry, Faculty of Engineering, University of Utsunomiya
  • Shimizu Tokuo
    Department of Environmental Chemistry, Faculty of Engineering, University of Utsunomiya
  • Sakai Kaoru
    Department of Environmental Chemistry, Faculty of Engineering, University of Utsunomiya

Bibliographic Information

Other Title
  • The Extraction of the Vanadium(V)-Pyrocatechol Violet Complex with Tridodecylethylammonium Bromide
Published
1981
DOI
  • 10.1246/bcsj.54.143
  • 10.1246/bcsj.54.700
Publisher
The Chemical Society of Japan

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Description

The extraction equilibria and the fundamental conditions were studied for extracting the tungsten(VI)–Pyrocatechol Violet complex anion in a form of an ionic associate with tridodecylethylammonium salt in carbon tetrachloride. The ternary complex has an absorption maxima at 575 nm in the organic phase. The optimum pH range for the extraction is 4.8–5.6. The distribution ratio and the molar absorptivity are 3.3×102 and 4.7×104 dm3 mol−1 cm−1 respectively. The composition of the ternary complex is estimated to be WO2(PV)2(R3R′N)2.The extraction constant would be:<BR>Kex=\frac[WO2(PV)2(R3R′N)2]o[WO2(PV)22−][R3R′N+]2.<BR>It is given by logKex=13.56. Many foreign cations can be masked with CyDTA.

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