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首页> 外文期刊>質量分析 >Construction of a Newly Designed Small-Size Mass Spectrometer for Helium Isotope Analysis: Toward the Continuous Monitoring of ~3He/~4He Ratios in Natural Fluids
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Construction of a Newly Designed Small-Size Mass Spectrometer for Helium Isotope Analysis: Toward the Continuous Monitoring of ~3He/~4He Ratios in Natural Fluids

机译：用于氦同位素分析的新型小型质谱仪的构建：旨在连续监测天然流体中〜3He /〜4He比

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摘要

The construction of a small-size, magnetic sector, single focusing mass spectrometer (He-MS) for the continuous, on-site monitoring of He isotope ratios (~3He/~4He) is described. The instrument is capable of measuring ~4He/~(20)Ne ratios dissolved in several different types of natural fluids of geochemical interest, such as groundwater and gas from hot springs, volcanoes and gas well fields. The ion optics of He-MS was designed using an ion trajectory simulation program "TRIO," which permits the simultaneous measurement of ~3He and ~4He with a double collector system under a mass resolution power (M/△M) of >700. The presently attained specifications of He-MS are; (1) a mass resolving power of ca. 430, sufficient to separate ~3He~+ from interfering ions, HD~+ and H_3~+, (2) ultra-high vacuum conditions down to 3×10~(-8)Pa, and (3) a sufficiently high sensitivity to permit amounts of ~3He to be detected at levels as small as 10~(13) cm~3 STP (3×10~6 atoms). Long term stability for ~3He/~4He analysis was examined by measuring the ~3He/~4He standard gas (HESJ) and atmospheric He, resulting in ~3% reproducibility and ≤5% experimental error for various amounts of atmospheric He from 0.3 to 2.3×10~(-6) cm~3 STP introduced into the instrument. A dynamic range of measurable ~3He/~4He ratios with He-MS is greater than 10~3 which was determined by measuring various types of natural fluid samples from continental gas (with a low ~3He/~4He ratio down to 2×10~(-8)) to volcanic gas (with a high ~3He/~4He ratio up to 3×10~(-5)). The accuracy and precision of ~3He/~4He and ~4He/~(20)Ne ratios were evaluated by comparing the values with those measured using well established noble gas mass spectrometers (modified VG5400/MS-Ⅲ and -Ⅳ) in our laboratory, and were found to be in good agreement within analytical errors. Usefulness of the selective extraction of He from water/gas using a high permeability of He through a silica glass wall at high temperature (700℃) is demonstrated.
机译：描述了用于连续，现场监测He同位素比（〜3He /〜4He）的小型磁性扇形单聚焦质谱仪（He-MS）的结构。该仪器能够测量溶解在几种不同类型的地球化学感兴趣的天然流体中的〜4He /〜（20）Ne比值，例如地下水，温泉，火山和气井田中的天然气。 He-MS的离子光学系统是使用离子轨迹模拟程序“ TRIO”设计的，该程序允许在质量分辨率功率（M /△M）> 700的情况下，使用双收集器系统同时测量〜3He和〜4He。目前获得的He-MS规格为： （1）的质量分辨力约为430，足以将〜3He〜+与干扰离子HD〜+和H_3〜+分开，（2）低至3×10〜（-8）Pa的超高真空条件，和（3）对允许以低至10〜（13）cm〜3 STP（3×10〜6原子）的水平检测到〜3He的量。通过测量〜3He /〜4He标准气体（HESJ）和大气中的He，检查了〜3He /〜4He分析的长期稳定性，对于从0.3到0.30的各种大气He量，导致〜3％的重现性和≤5％的实验误差仪器引入2.3×10〜（-6）cm〜3的STP。用He-MS测量的〜3He /〜4He比的动态范围大于10〜3，这是通过测量大陆气中各种类型的天然流体样品（〜3He /〜4He比低至2×10）确定的〜（-8））到火山气（〜3He /〜4He比高至3×10〜（-5））。通过与实验室中使用完善的稀有气体质谱仪（改进的VG5400 /MS-Ⅲ和-Ⅳ）测量的值进行比较，评估〜3He /〜4He和〜4He /〜（20）Ne比的准确性和精密度。 ，并且发现在分析误差内吻合良好。证明了在高温（700℃）下使用高渗透性的He通过二氧化硅玻璃壁从水中选择性萃取He的有用性。

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  • 来源
    《質量分析》 |2012年第6期|4.1-4.10|共10页
  • 作者

    Ken-ichi Bajo; Hirochika Sumino; Michisato Toyoda; Ryuji Okazaki; Takahito Osawa; Morio Ishihara; Itsuo Katakuse; Kenji Notsu; George Igarashi; Keisuke Nagao;

  • 作者单位

    Geochemical Research Center, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo, Japan,Department of Natural History Sciences, Hokkaido University, Kita-ku, Sapporo, Japan;

    Geochemical Research Center, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo, Japan;

    Project Research Center for Fundamental Sciences, Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan;

    Geochemical Research Center, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo, Japan,Department of Earth and Planetary Sciences, Faculty of Sciences, Kyushu University, Hakozaki, Fukuoka, Japan;

    Geochemical Research Center, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo, Japan,Quantum Beam Science Directorate, Japan Atomic Energy Agency (JAEA), Naka-gun, Ibaraki, Japan;

    Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan;

    Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan;

    Geochemical Research Center, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo, Japan;

    Geochemical Research Center, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo, Japan;

    Geochemical Research Center, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan;

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  • 正文语种 eng
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  • 关键词

    small-size mass spectrometer; monitoring of ~3He/~4He ratio; he extraction from natural fluids;

    机译：小型质谱仪监测〜3He /〜4He比;从天然液体中提取;

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