| Project/Area Number |
12680526
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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 |
Environmental dynamic analysis
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| Research Institution | Akita Prefectural University |
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Principal Investigator |
MUSASHI Masaaki Science and Technology, Dept.of Systems, Associate Professor, システム科学技術学部, 助教授 (00315615)
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| Co-Investigator(Kenkyū-buntansha) |
PHILLIP van Cappellan Dept, of Geochemistry, Utrecht Univ, Professor
HANS. GM Eggenkamp Dept, of Geochemistry, Utrecht Univ, Associate. Prof
CAPELLAN Phillip van Utrecht University, Dept.of Geochemistry, Professor
EGGENKAMP Hans, g.m. Utrecht University, Dept.of Geochemistry, Assintant Professor
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2001: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2000: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | chlorine stable isotopes / pollutants / chlorinated organic compound / supercritical water / decomposition / isotope effect / anion exchange / isotope analysis / 有機塩素化合物 |
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| Research Abstract |
With a goal to understand the fate and behavior of chlorinated organic pollutants such as dioxins, chlorine stable isotopes have been paid a great attention. In order to optimize the isotopes as an environmental tracer, we have investigated several analytical methods for Cl extraction from chlorinated organic compounds by supercritical water and for Cl concentration by using anion-exchange resin. Summary of the results in the studies were as follows.
By using a high pressure cell controlled the temperature by electric furnace, we decomposed powdered poly-vinyl chloride (VOC) using supercritical water at over 600 degree-C and 30MPa, and recovered at most 80% of the VOC.
Four mili-gram of Cl diluted during extraction process was concentrated 200ml into 8ml by processing the substitution chromatography with anion-exchange resin. The obtained Cl concentration (4mg/8ml) was well enough to use for Cl isotope analysis.
By using pre-concentration method such as cold-finger prior to mass-analysis, we could reduce the Cl amount from 4 mg to 1mg.
Magnitude of Cl isotope fractionation possibly occurred during de-chlorination and/or Cl concentration was measure by using anion-exchange chromatography, and was 1.00030 ± 0.00006(1σ) at 25℃.
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