| Project/Area Number |
04403012
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
地質学一般
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| Research Institution | Nagoya University |
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Principal Investigator |
TANAKA Tsuyoshi Nagoya University, Professor, 理学部, 教授 (00236605)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Kazuhiro Nagoya University, Associ.Professor, 理学部, 助教授 (90111624)
ADACHI Mamoru Nagoya University, Professor, 理学部, 教授 (10113094)
SUGISAKI Ryuichi Nagoya University, Professor, 理学部, 教授 (10022576)
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥24,900,000 (Direct Cost: ¥24,900,000)
Fiscal Year 1994: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1993: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1992: ¥21,200,000 (Direct Cost: ¥21,200,000)
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| Keywords | Platinum group elements / Mass spectrometry / Negatively charged ion / Isotope dilution / Osmium / Rhenium / Iridium / Ruthenium |
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| Research Abstract |
The platinum group elements are considered to reflect a feature of cumulate phase during magmatic differentiation. However, the geochemical behavior of the elements is not known well. The aim of the research is to clarify the geochemical behavior of the elements using an isotope dilution technique. A negative thermal ionization technique using a small and economical quadrupole mass spectrometer is presented. Intense ion beam of negatively charged oxides of Re, Os, Ir and Ru were observed. The principal molecular species produced in this technique are ReO_4^-, OsO_3^-, IrO_2^- and RuO_3^-. The production of these ion species in the distinct mass ranges allows the isotopic analyzes without any chemical separation of these elements each other. For 5ng Os, all Os isotopic ratios were determined with the precision of better than <plus-minus>0.5% except ^<184>Os/^<192>Os because of very low isotopic abundance of ^<184>Os. For 30ng Re, 10ng Ir and 30ng Ru, isotopic measurements were also made with the precision of better than <plus-minus>0.5%. The precision Os the isotopic ratio measurements for Re, Os, Ir and Ru is sufficient for the isotope dilution technique to determine the concentration of these elements in geological samples/ In addition, a iridosmine from Hokkaido was analyzed for Os and Ir by direct loading technique, and ^<187>Os/^<186>Os ratio of 1.0220<plus-minus>0.0089 was obtained.
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