| Project/Area Number |
15550061
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Analytical chemistry
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| Research Institution | Iwate University |
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Principal Investigator |
KIKUCHI Yoichi Iwate University, Faculty of Education, associate professor, 教育学部, 助教授 (50241493)
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| Co-Investigator(Kenkyū-buntansha) |
IMAI Shoji The University of Tokushima, Faculty of Integrated Arts and Sciences, Professor, 総合科学部, 教授 (50232591)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2005: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2004: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2003: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | thermo-responsive polymer / PVME / extraction / preconcentration / tetraalkylammonium salts / copper / 海水 / キレート抽出 / 第四級アンモニウム塩 / カドミウム / イオン対抽出 |
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| Research Abstract |
Some kind of water-soluble polymers, including poly (vinyl methyl ether)(PVME), in aqueous solutions exhibit a lower critical solution temperature (LCST)(for PVME around 308 K). They are water-soluble at low temperatures but their heating above the LCST results in phase separation. By the phase separation, certain hydrophobic substances in aqueous solution are efficiently incorporated into the polymer phase, and thus, such thermo-responsive polymers can be used as an extracting medium.
In this study, the distribution equilibria of 8-quinolinolate metal chelates system and ion pairs of tetraalkylammonium salts system into temperature-induced separation phase of PVME have been investigated at 323 K. From an analysis of the distribution data, we can elucidate the distribution equilibria, and values of the extraction constant, K_<ex>. These results of polymer-mediated extraction were compared with those in conventional solvent extraction in order to clarify the natures of the polymer phase.
Moreover, we have developed new preconcentration technique using themo-responsive polymer (PVME) for the determination of trace metal ions. As the model case of this technique, we established the optimum conditions for quantitave extraction of the ion pair of the copper-neocuproine chelate with picrate ion into the polymer phase having the very small volume. After dissolving the polymer phase in a small amount of acetone, the solution was analyzed by graphite AAS. This method was successfully applicable to the determination of copper in sea water.
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