The extraction of the tungsten(VI)-Pyrocatechol Violet complex with tridodecylethylammonium bromide.
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概要
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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 3.3×10<SUP>2</SUP> and 4.7×10<SUP>4</SUP> dm<SUP>3</SUP> mol<SUP>−1</SUP> cm<SUP>−1</SUP> respectively. The composition of the ternary complex is estimated to be WO<SUB>2</SUB>(PV)<SUB>2</SUB>(R<SUB>3</SUB>R′N)<SUB>2</SUB>.The extraction constant would be:<BR><I>K</I><SUB>ex</SUB>=\frac[WO<SUB>2</SUB>(PV)<SUB>2</SUB>(R<SUB>3</SUB>R′N)<SUB>2</SUB>]<SUB>o</SUB>[WO<SUB>2</SUB>(PV)<SUB>2</SUB><SUP>2−</SUP>][R<SUB>3</SUB>R′N<SUP>+</SUP>]<SUP>2</SUP>.<BR>It is given by log<I>K</I><SUB>ex</SUB>=13.56. Many foreign cations can be masked with CyDTA.
- 公益社団法人 日本化学会の論文
著者
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Shimizu Tokuo
Department Of Applied Chemistry Faculty Of Engineering Utsunomiya University
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Sakai Kaoru
Department Of Environmental Chemistry Faculty Of Engineering University Of Utsunomiya
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Shijo Yoshio
Department Of Applied Chemistry Faculty Of Engineering Utsunomiya University
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Sakai Kaoru
Department of Environmental Chemistry, Faculty of Engineering, University of Utsunomiya
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