The extraction of the chromium(III) ion from trichloroacetate solutions to inert solvents containing trioctylphosphine oxide.
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概要
- 論文の詳細を見る
Chromium(III) has been extracted with 0.1 mol dm<SUP>−3</SUP> trioctylphosphine oxide(TOPO) in various inert solvents from a 0.1 mol dm<SUP>−3</SUP> trichloroacetate(TCA<SUP>−</SUP>) buffer solution of pH 3.5 to 6.0. As diluents of TOPO, hexane and cyclohexane are most effective, while chloroform is quite ineffective. The extraction mechanism has been clarified by analyzing separately the distribution of water, trichloroacetic acid(HTCA), and the Cr(III) ion between the aqueous and organic phases. Water and HTCA are present in the cyclohexane phase as H<SUB>2</SUB>O·TOPO and HTCA·TOPO respectively. Chromium(III) is extracted with TOPO into cyclohexane as an ionassociation complex like Cr(H<SUB>2</SUB>O)<SUB>6</SUB><SUP>3+</SUP>(TCA<SUP>−</SUP>)<SUB>3</SUB>·3TOPO, and the extraction constant is 10<SUP>7.68</SUP>. It is concluded that the hexahydrated Cr(III) ion is solvated by three molecules of TOPO, forming an ion pair with three trichloroacetate anions. The extractability of Cr(III) in the present system depends most effectively on the concentration of HTCA-free TOPO in the organic phase.
- 公益社団法人 日本化学会の論文
著者
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Imura Hisanori
Department Of Chemistry Faculty Of Science Ibaraki University
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Honjo Takaharu
Department Of Chemistry Faculty Of Science Kanazawa University
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Kiba Toshiyasu
Department of Chemistry, Faculty of Science, Kanazawa University
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Imura Hisanori
Department of Chemistry, Faculty of Science, Kanazawa University
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