Synergistic Extraction Equilibrium of Gallium(III) with Di(2-ethylhexyl)phosphoric Acid and 8-Quinolinol Derivatives into Supercritical Carbon Dioxide
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- OHASHI Akira
- College of Science, Ibaraki University
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- KAWASHIMA Natsumi
- College of Science, Ibaraki University
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- SATO Kazuaki
- College of Science, Ibaraki University
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- KIM Haeng-Boo
- College of Science, Ibaraki University
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Abstract
The synergistic effect of five 8-quinolinol derivatives (HQs) on the extraction of gallium(III) with di(2-ethylhexyl)-phosphoric acid (D2EHPA or HA) from weak nitric acid into supercritical carbon dioxide (SC-CO2) was investigated. 8-Quinolinol (Hq), 5-ethoxymethyl-8-quinolinol (HO2q), 5-hexyloxymethyl-8-quinolinol (HO6q), 5-(2,2,2-trifluoroethoxymethyl)-8-quinolinol (HFO2q), and 5-chloro-8-quinolinol (5-Cl-Hq) were used as synergists. Synergism was observed for all of the HQs. The synergistic effect increased in the following order: Hq < HO2q < HFO2q < 5-Cl-Hq ≈ HO6q. The extent of synergism can be related to both the distribution constant and the acid dissociation constant of the HQ. The synergistic extraction equilibrium of gallium(III) with D2EHPA and 5-Cl-Hq into SC-CO2 was investigated; the results suggest that the composition of the extracted complex is as GaA2Q·HA. The synergistic extraction mechanism was the same for both SC-CO2 and n-heptane. The synergistic extraction equilibrium constants in both cases were calculated based on the experimental results.
Journal
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- Analytical Sciences
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Analytical Sciences 29 (1), 127-132, 2013
The Japan Society for Analytical Chemistry
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Details 詳細情報について
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- CRID
- 1390282679235831168
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- NII Article ID
- 10031147338
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- NII Book ID
- AA10500785
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- COI
- 1:STN:280:DC%2BC3s3otFKlsQ%3D%3D
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- ISSN
- 13482246
- 09106340
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- NDL BIB ID
- 024212222
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- PubMed
- 23303097
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed