Journal of the Mass Spectrometry Society of Japan
Online ISSN : 1880-4225
Print ISSN : 1340-8097
ISSN-L : 1340-8097
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Volume 38, Issue 5
Displaying 1-3 of 3 articles from this issue
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REGULAR PAPERS
  • Lead Isotope Analyses of Standard Rock Samples
    Yoshiyuki Koide, Eizo Nakamura
    1990 Volume 38 Issue 5 Pages 241-252
    Published: 1990
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.38.241
    JOURNAL FREE ACCESS
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    New results on lead isotope compositions of standard rock samples and their analytical procedures are reported. Bromide form anion exchange chromatography technique was adopted for the chemical separation of lead from rock samples. The lead contamination during whole analytical procedure was low enough to determine lead isotope composition of common natural rocks. Silica-gel activator method was applied for emission of lead ions in the mass spectrometer. Using the data reduction of "unfractionated ratios", we obtained good reproducibility, precision and accuracy on lead isotope compositions of NBS SRM. Here we present new reliable lead isotope compositions of GSJ standard rock samples and USGS standard rock, BCR-1.
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  • Effects of Chemical Forms in Rb Isotope Analysis
    Morikazu Hosoe, Yasuhiko Fujii
    1990 Volume 38 Issue 5 Pages 253-259
    Published: 1990
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.38.253
    JOURNAL FREE ACCESS
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    To develop a reliable method for mass spectrometric determination of rubidium isotopic ratios, four rubidium chemical forms of nitrate, sulfate, chloride, and iodide prepared from an isotopic standard sample NBS-SRM984 were examined using a double-filament thermal-lonization ion souce. The deviation between the observed isotopic ratio and the true value was seen in each sample and shown to decrease with increasing in the mass of counter ion, except sulfate. The deviation were explained as the isotopic fractionation effect in evaporation of the samples based on a theoretical equation given by Kanno. Conclusively, among the tested salts, rubidium iodide has been selected as the best chemical form with the high stability in the mesured values of isotopic ratios.
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  • Large Sample Volume Injection on Capillary GC/MS
    Part 2: The Investigation of Reduced-Pressure Interface
    Chuichi Watanabe, Kuniko Teraishi, P. W. Langvardt, Keiji Hashimoto
    1990 Volume 38 Issue 5 Pages 261-268
    Published: 1990
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.38.261
    JOURNAL FREE ACCESS
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    Direct injection method for large volume samples, 10 to 100 μl, into an ordinary capillary column (0.3 mm i.d.) using a packed column injector has many advantages in GC/MS application. In order to suppress a large volume of solvent, a reduced-pressure interface which operates under reduced-pressure is selected as a GC/MS interface. The interface which provides complete transfer of analyte is investigated in view of peak band broadening, chemical activity and suppression of unwanted sample components, and furthermore advantages and disadvantages are discussed.
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