A Trial Modification of a Surface Ionization Ion Source for Direct Sample Loading for Isotope Analysis
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概要
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A trial modification was carried out to the conventional surface (thermal) ionization ion source. A direct sample loading of milligram sized chip of solid sample completely free from terrestrial chemical additional reagents is adopted in the modification. A milligram sized block sample is set into a kind of boat filament made of tantalum, heated and evaporated in the form of atomic vapor with no addition of silica gel or phosphoric acid. This point is perfectly different from other previous works of direct loading methods. The atoms are ionized at the surface of the side filament made of rhenium. The direct loading ionization system was installed in a virtual image compact double focusing mass spectrometer whose mass resolving power is reached over 5,000. As an example of isotope analysis, a 0.5 mg weighed chip of commercially sold pure magnesium metal was loaded as a sample. It gave reasonable isotope ratio 25Mg/24Mg=0.12472±0.00045 and 26Mg/24Mg=0.13564±0.00050; δ26=0.15‰. Several terrestrial mineral samples, forsterite, enstatite, hypersthene, hornblende, and serpentine were also analyzed for magnesium isotope ratios, and δ26s for those samples were distributed -1.7‰ to +4.9‰. Although the reproducibility of isotope analysis is ±3.5‰, and may be comparatively too large to apply the detection of minute isotope anomaly, the newly developed ion source was found to be usable for the isotope analysis of a milligram sized solid samples by the method of direct loading completely free from the additives of chemical reagents.
- 日本質量分析学会の論文
- 2000-10-01
著者
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NAKAMURA Hideyuki
Department of Medical Information, Schering-Plough K.K
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OZAWA Hiroaki
Department of Applied Chemistry, Kyushu University
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Nishimura Hiroshi
Department of Cardiovascular Medicine, Tokyo Graduate School of Medicine
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Ozawa Hiroaki
International Cooperation Center For The Teacher Education And Training Naruto University Of Educati
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Murata Mamoru
Department of Earth Sciences,Faculty of Science,Naruto University of Education
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Murata Mamoru
Department Of Geosciences Faculty Of Science Naruto University Of Education
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Nishimura Hiroshi
Basic Human Science For Integrated Studies Naruto University Of Education
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Kozai Takeshi
Department Of Geosciences Faculty Of Science Naruto University Of Education
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HISAYOSHI Keiji
Department of Geological Sciences, Faculty of Science, Naruto University of Education
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NISHI Yuriko
Department of Geological Sciences, Faculty of Science, Naruto University of Education
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OTA Shinya
Department of Geological Sciences, Faculty of Science, Naruto University of Education
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HATAKEYAMA Tomoe
Department of Geological Sciences, Faculty of Science, Naruto University of Education
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Ota Shinya
Department Of Geological Sciences Faculty Of Science Naruto University Of Education
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Nishi Yuriko
Department Of Geological Sciences Faculty Of Science Naruto University Of Education
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Hisayoshi Keiji
Department Of Geological Sciences Faculty Of Science Naruto University Of Education
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Hatakeyama Tomoe
Department Of Geological Sciences Faculty Of Science Naruto University Of Education
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Nakamura Hideyuki
Department Of Medical Information Schering-plough K.k
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Ozawa Hiroaki
Department Of Applied Chemistry Graduate School Of Engineering Kyushu University
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Hisayoshi Keiji
Department Of Earth And Space Sciences Graduate School Of Sciences Osaka University
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Nakamura Hideyuki
Department Of Geological Sciences Faculty Of Science Naruto University Of Education
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Nishimura Hiroshi
Department Of Applied Chemistry Faculty Of Engineering Osaka Institute Of Technology
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Murata Mamoru
Natural Science Education (science) Naruto University Of Education
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