2004 Fiscal Year Final Research Report Summary
Separation and concentration of ultra trace metals by gel extraction
| Project/Area Number |
15550071
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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 | Yamaguchi University |
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Principal Investigator |
MATSUSAKI Koji Yamaguchi University, Faculty of Engineering, Professor, 工学部, 教授 (50035177)
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| Co-Investigator(Kenkyū-buntansha) |
ENDO Nobutaka Yamaguchi University, Faculty of Engineering, Assistant, 工学部, 助手 (40314819)
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| Project Period (FY) |
2003 – 2004
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| Keywords | Gel extraction / Metal ion / Ion pair / Separation / Concentration / Graphite furnace AAS / Fluorometry / Pre-treatment |
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| Research Abstract |
1.Various metal ions form complex anions with Chrome Azurol S (CAS). The ion pair of this metal complex anion with CAS and Zephiramine (benzyldimethyltetradecylammonium chloride) was quantitatively extracted into the gel of poly(vinyl methyl ether) (PVME). Applying this phenomenon, trace metal ions in aqueous solution could be separated and concentrated into the PVME gel. The gelation of aqueous PVME solution was made by salting-out techniques. After centrifuging of mixture solution, the gel was separated from the bulk aqueous solution and dissolved into small amount of N,N-dimethylformamide (DMF). The metals in the DMF solution were determined by the graphite furnace atomic absorption spectrometry (GFAAS). Using this method, 100 times concentration of metal was established and good separation of metal ion from another metal ions were observed. This result shows that this collection by PVME gel is very useful for the pre-concentration for the GFAAS determination. Because alkaline and a
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lkaline earth metal ions can not be collected in PVME gel, this GFAAS determination with gel collection was applied to determination of trace metals in common salt. After 50-100 times concentration, the ppb-level determination of metals in the sample could be successfully carried out.
2.Ion pair of copper(II) complex with Eriochrome Black T and Zephiramine was similarly collected into the PVME gel. The separated gel was also dissolved in DMF and copper in DMF solution was also determined with GFAAS. One hundred times concentration of copper was established, but separation of gel from bulk solution was difficult.
3.Extraction of tellurium complex with Bismuthiol II into PVME gel was also investigated. In this case, only 10 times concentration was carried out.
4.In order to fluorometric determination, extraction of aluminum complex with Morin into the PVME was investigated. Although the determination of aluminum by fluorometry with Morin was very sensitive, in this case, blank value was large.
5.These results show that the gel extraction of mixture using the CAS and Zephiramine was very suitable for pre-concentration of metals for the GFAAS determination. Less
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