Extraction of Co(II) and Ni(II) ammine cations from aqueous solutions into chloroform by highly lipophilic crown carboxylic acids |
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| Authors: | Jerzy Strzelbicki A. Charewicz Richard A. Bartsch |
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| Affiliation: | (1) Institute of Inorganic Chemistry and Metallurgy of Rare Elements, Technical University of Wroclaw, 50-370 Wroclaw, Poland;(2) Department of Chemistry and Biochemistry, Texas Tech University, 79409-4260 Lubbock, TX, USA |
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| Abstract: | The proton-ionizable crown ethers, 2-[(sym-dibenzo-14-crown-4)oxy]-decanoic acid (1), 2-[sym-dibenzo-16-crown-5)oxy]decanoic acid (2), and 2-[sym-dibenzo-19-crown-6)oxy]decanoic acid (3) efficiently extract Co(II) and Ni(II) ammine cations from highly alkaline aqueous solutions (pH>10) into chloroform. For extractions of the individual metal species,2 is more efficient than1 or3. In competitive extraction systems, good selectivity for Co(II) ammine cations over Ni(II) ammine cations is observed. |
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| Keywords: | Solvent extraction crown carboxylic acids Co(II) and Ni(II) ammine cations |
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