Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (11): 110501-110501.doi: 10.11889/j.0253-3219.2016.hjs.39.110501

• NUCLEAR PHYSICS, INTERDISCIPLINARY RESEARCH • Previous Articles     Next Articles

Separation of hydrogen isotopic spin isomers by gas chromatography using alumina PLOT column

WANG Weiwei1,2, REN Xingbi2, XIA Lidong2, Y U Mingming2, LI Hairong2, Z HANG Weiguang2, ZHOU Xiaosong2   

  1. 1 Key Laboratory of Radiation Physics and Technology Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China;
    2 Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
  • Received:2016-07-26 Revised:2016-10-05 Online:2016-11-10 Published:2016-11-12
  • Supported by:

    Supported by Director Foundation of China Academy of Engineering Physics (No.YZ2015009)

Abstract:

Background: The cryogenic properties of hydrogen isotopes are affected by ortho-para ratio of the homonuclear molecules (H2, D2, T2). Purpose: It is necessary to determine the ortho-para ratio. Methods: A cryogenic elution chromatographic method for determination of the ortho-para ratio is established, in which an activated alumina porous layer open tubular (PLOT) column with 30 m×0.53 mm×20 μm was applied for separation of the spin isomers. Results: The isomers were well separated at base line (the resolution Rs>1.5) at temperature of liquid nitrogen (78 K), compared with the conventional packed columns. When the Neon carrier rate is 5 mL·min-1, the resolution of ortho-para protium Rs (o-H2, p-H2) and ortho-para deuterium Rs (o-D2, p-D2) is 6.9, 1.8, respectively. Conclusion: The resolution is affected by sample content and flow rate. According to integration of peak areas, the ortho-para rate at 300 K for protium and deuterium is 2.77:1, 1.78:1, respectively, which is in accordance with the theoretical results. Partial separation is obtained between ortho-H2 and HD, and the resolution Rs (o-H2, HD) reached 0.4, theoretical plates of 3.9×105 should be required to achieve the baseline separation (Rs=1.5).

Key words: Hydrogen isotopic spin isomers, Ortho-para ratio, Gas chromatography, Activated alumina, PLOT column

CLC Number: 

  • TL62