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 40, Issue 6
Displaying 1-3 of 3 articles from this issue
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REGULAR PAPERS
  • Ion Optics for the High Performance Mass Spectrometer of Double Focusing Type
    Hisashi MATSUDA
    1992 Volume 40 Issue 6 Pages 283-291
    Published: 1992
    Released on J-STAGE: July 20, 2007
    DOIhttps://doi.org/10.5702/massspec.40.283
    JOURNAL FREE ACCESS
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    Ion optics for the high performance mass spectrometer is investigated. In order to estimate the characteristics of a mass spectrometer numerically, a performance factor, PF, and an aberration factor, AF, are introduced and defined. The PF is defined as a product of four factors related to C/X (C, mass dispersion; X, image magnification), deflection angle of magnetic sector, total path length and ion beam transmission through magnet gap. Each factor consists of a ratio compared to the value for 180° magnetic analyzer. The AF is defined as a maximum resolving power calculated from the simulated image under the incident ion beam conditions of 1% spread of α, δ, y, β.
    Almost perfect higher order focusing and high performance are attained by mass spectrometers with the field arrangement of QQHQC and QQQHQC (Q, quadrupole; H, homogeneous magnetic sector; C, cylindrical electric sector). In these mass spectrometers, the value of PF reaches 100 and that of AF 260,000.
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  • Application of Capillary GC/MS for Identification of Drugs on Forensic Chemistry II: Chemical Confirmation of Opium and Opium Poppy by Simultaneous Analyzing Contained Alkaloids and Meconic Acid
    Toshitaka OHSHITA, Yoshihiko MIYATA, Hiroaki ANDO
    1992 Volume 40 Issue 6 Pages 293-300
    Published: 1992
    Released on J-STAGE: July 20, 2007
    DOIhttps://doi.org/10.5702/massspec.40.293
    JOURNAL FREE ACCESS
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    On forensic chemistry, presence of opium is only confirmed by detection of the characteristic alkaloids like morphine and also meconic acid. The detection of meconic acid has required its isolation, purification and derivation. Moreover, it has taken many hours to analyze main alkaloids in opium by GC or GC/MS.
    This study was aimed simultaneous analyzing the contained alkaloids and meconic acid and shortening the analyzing time by application of capillary GC/MS.
    After treatment of opium with diazomethane, methylated meconic acid, and some main alkaloids were separated with capillary column to be analyzed by capillary GC/MS at short time; therefore, the present method is suitable for the confirmation of opium. This method was applied for confirmation of opium poppy.
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