Extraction equilibria of mercury(II) from hydrochloric acid with trialkylphosphine sulfides.
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概要
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The extraction of mercury(II) from hydrochloric acid was compared using five kinds of sulfur-containing extractants. Mercury(II) was extracted most effectively by trialkylphosphine sulfides. Subsequently, the distribution equilibria of mercury(II) from hydrochloric acid with triisobutylphosphine sulfide (TIBPS=\barS) and trioctylphosphine sulfide (TOPS=\barS) in toluene have been measured at 303 K in order to clarify the concentration dependencies of the reactant species. It was found that mercury(II) is extracted according to the solvation reaction by TIBPS or TOPS as a mercury(II): extractant 1:2 complex, HgCl<SUB>2</SUB>S<SUB>2</SUB>, in the range of low loading ratio of mercury(II) to the extractants, and as a 1:1 binuclear complex, (HgCl<SUB>2</SUB>)<SUB>2</SUB>S<SUB>2</SUB>, in the region of high loading ratios, as follows:<BR>HgCl<SUB>2</SUB>+2\barS\rightleftharpoons‾HgCl<SUB>2</SUB>S<SUB>2</SUB> <I>K</I><SUB>e</SUB><BR>2HgCl<SUB>2</SUB>+2\barS\rightleftharpoons‾(HgCl<SUB>2</SUB>)<SUB>2</SUB>S<SUB>2</SUB> <I>K</I><SUB>e</SUB>′<BR>The extraction equilibrium constants, <I>K</I><SUB>e</SUB> and <I>K</I><SUB>e</SUB>′, were evaluated as <I>K</I><SUB>e</SUB>=4.0×10<SUP>5</SUP> (dm<SUP>3</SUP> mol<SUP>−1</SUP>)<SUP>2</SUP> and <I>K</I><SUB>e</SUB>′=2.0×10<SUP>8</SUP> (dm<SUP>3</SUP> mol<SUP>−1</SUP>)<SUP>3</SUP> for TIBPS and as <I>K</I><SUB>e</SUB>=7.2×10<SUP>6</SUP> (dm<SUP>3</SUP> mol<SUP>−1</SUP>)<SUP>2</SUP> for TOPS.
- 公益社団法人 日本化学会の論文
著者
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Baba Yoshinari
Department Of Applied Chemistry Faculty Of Engineering Miyazaki University
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Inoue Katsutoshi
Department Of Applied Chemistry Faculty Of Science And Engineering
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Ueda Takashi
Department Of Applied Biology And Chemistry Tokyo University Of Agriculture
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Inoue Katsutoshi
Department of Industrial Chemistry, Faculty of Science and Engineering, Saga University
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Ueda Takashi
Department of Industrial Chemistry, Faculty of Science and Engineering, Saga University
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Umezaki Yukihiro
Department of Industrial Chemistry, Faculty of Science and Engineering, Saga University
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Baba Yoshinari
Department of Industrial Chemistry, Faculty of Science and Engineering, Saga University
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