三氧化二铝PLOT柱气相色谱法分离氢同位素自旋异构体

doi:10.11889/j.0253-3219.2016.hjs.39.110501

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 Weiwei^1,2, REN Xingbi², XIA Lidong², Y U Mingming², LI Hairong², Z HANG Weiguang², ZHOU Xiaosong²

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

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 R_s>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 R_s (o-H₂, p-H₂) and ortho-para deuterium R_s (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 R_s (o-H₂, HD) reached 0.4, theoretical plates of 3.9×10⁵ should be required to achieve the baseline separation (R_s=1.5).

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

CLC Number:

TL62

WANG Weiwei, REN Xingbi, XIA Lidong, Y U Mingming, LI Hairong, Z HANG Weiguang, ZHOU Xiaosong. Separation of hydrogen isotopic spin isomers by gas chromatography using alumina PLOT column[J].Nuclear Techniques, 2016, 39(11): 110501-110501.

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

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