| Project/Area Number |
17540463
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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 |
Geochemistry/Astrochemistry
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| Research Institution | Gakushuin University |
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Principal Investigator |
MASAHISA Kakiuchi Gakushuin University, Facaety of Science, Assistant Professor (60146321)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAYAMA Hideyuki Gakushuin Unrversity, Facuefy of Science, Assistant Professor (00155889)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,470,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥270,000)
Fiscal Year 2007: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2006: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2005: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Isotopic Fractionation Factor / Hydrogen Isotope / Oxygen Isotope / Hydrous Minerals / Crystalline Hydrates / Hydration Complex / Raman Spectra / Reduced Partition Function Ratio |
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| Research Abstract |
The analytical methods of the hydrogen isotope (D/H) ratios to obtain the fractionation factor of water molecules were used two types in this study. The hydrogen isotope ratios of hydrogen gas in equilibrium with aqueous solutions at 25℃ using a hydrophobic platinum catalyst and those of hydrogen gas, converted quantitatively from water vapor by pure zinc in a furnace were measured, respectively. Using these methods, We could obtain: the hydrogen fractionation factor relating to the aqueous salt solutions and hydrous minerals.
The analytical method of the oxygen isotope (^<18>O/^<16>O) ratios vas attempt to use the new mass spectrometer "Isoprime" which was developed to measure light stable isotopes of organic compound by continues flow system capable of the small amount of samples. We attached the equipment of elemental analyzer before the "Isoprime". The various inorganic salts containing oxygen were decomposed into the oxygen gas by the pyrolysis at 1230℃ using He carrier. The oxygen
… More
'gas is converted to carbon mono-oxide by carbon graphite, and separated using the gas chromatograph. Consequently, we measured oxygen isotope ratios of the carbon mono-oxide by the "Isoprime".
In this study, we may possibly measure the oxygen isotope ratios of various carbonates and sulfates, and crystalline hydrates of sulfate and chloride in the experimental error within the range from 1 to 2%0. In addition, we could accomplish to comply with the standardization of SMOW.
The crystal water in crystalline hydrates of magnesium sulfate exhibits larger depletion of deuterium and enrichment of heavier oxygen than mother liquor. The hydrogen and oxygen isotope ratios of the crystal water of magnesium sulfate' heptahydrate do not exhibit the difference from those of magnesium sulfate hexahydrate. Based on the frequencies obtained from the Raman spectrum of H_2^<16>O, D_2^<16>O and H_2^<18>O of cupper dichloride dihydrate, we are going to calculate the hydrogen and oxygen fractionation factors between cupper dichloride dihydrate and water vapor theoretically. Less
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