Spectrophotometric Study on the Extraction of the Ternary Complex Composed of Vanadium(V), 8-Hydroxyquinoline-5-sulfonic Acid and Zephiramine
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概要
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The ternary complex composed of vanadium(V),8-hydroxyquinoline-5-sulphonic acid (H<SUB>2</SUB>QS), and zephiramine (Z<SUP>+</SUP>Cl<SUP>−</SUP>) was extracted into chloroform. The absorption maxima of the ternary complex in the organic layer were 375 and 580 nm at pH 2.8 and 375 nm at pH 4.8. The optimum pH range for the extraction was 4.5–5.4. Beer's law held for 1.29–35.6 μg of vanadium(V). The molar absorptivity of the complex was 0.99×10<SUP>4</SUP> cm<SUP>−1</SUP> mol<SUP>−1</SUP> l. The composition of the ternary complex was estimated to be [VO<SUB>2</SUB><SUP>+</SUP>Z<SUP>+</SUP>(QS<SUP>2−</SUP>Z<SUP>+</SUP>)<SUB>2</SUB>]<SUB>o</SUB> and the extraction equilibrium was given by<BR>VO<SUB>2</SUB><SUP>+</SUP>+2[(HQS<SUP>−</SUP>Z<SUP>+</SUP>)]<SUB>o</SUB>+Z<SUP>+</SUP>+2OH<SUP>−</SUP>\rightleftharpoons[VO<SUB>2</SUB><SUP>+</SUP>Z<SUP>+</SUP>(QS<SUP>2−</SUP>Z<SUP>+</SUP>)<SUB>2</SUB>]<SUB>o</SUB>+2H<SUB>2</SUB>O (1)<BR>The logarithm of the equilibrium constant <I>K</I> of this equation was found to be 32.57±0.49.
- 公益社団法人 日本化学会の論文
著者
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Sugawara Masao
Department Of Chemistry College Of Humanities And Sciences Nihon University
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Kambara Tomihito
Department Of Chemistry Faculty Of Science Hokkaido University
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