MA Meng-yao,AN Shao-hang,LIU Shu-jiang,SHENG Yu-qiang,CHANG Yin-zhong,CHEN Zhan-ying,LI Qi,WANG Shi-lian.Research on the Method for Oxygen and Argon Separation and Argon Quantitative Analysis Based on Gas Chromatography[J].Journal of Instrumental Analysis,2025,44(11):1-5.
MA Meng-yao,AN Shao-hang,LIU Shu-jiang,SHENG Yu-qiang,CHANG Yin-zhong,CHEN Zhan-ying,LI Qi,WANG Shi-lian.Research on the Method for Oxygen and Argon Separation and Argon Quantitative Analysis Based on Gas Chromatography[J].Journal of Instrumental Analysis,2025,44(11):1-5. DOI: 10.12452/j.fxcsxb.25021489.
Research on the Method for Oxygen and Argon Separation and Argon Quantitative Analysis Based on Gas Chromatography
Ar是全面禁止核试验条约现场视察监测的重要核素,在氩总量定量分析时,样品气中残留的微量氧气会干扰氩的测量结果。针对氧氩分离分析难题,基于气相色谱技术,实验研究了色谱柱箱温度、进样口压力、氧氩混合气浓度对氧氩分离效果的影响。结果表明,采用HP-5A分子筛色谱柱,在柱箱温度为-65 ℃,进样口压力为35 kPa时,可实现不同浓度氧氩的分离分析。在该条件下,50% O
clear explosions,is a key Comprehensive Nuclear-Test-Ban Treaty(CTBT) verification indicator. Its activity concentration is measured against collected argon volume; levels above background indicate a nuclear test. However,residual oxygen in samples,which has nearly identical physical properties to argon,is difficult to remove completely,causing errors in argon volume and
37
Ar quantification,compromising verification reliability and potentially leading to false compliance conclusions
.
To address this oxygen-argon separation analytical challenge,this study systematically investigated the separation efficiency of oxygen and argon mixtures using gas chromatography(GC). Key operational parameters including column oven temperature,inlet pressure,and gas concentration were optimized to achieve the baseline separation of oxygen and argon. After an extensive series of experiments and in-depth analysis,the results demonstrated that a column oven temperature of -65 ℃ and an inlet pressure of 35 kPa could effectively separate oxygen and argon across a wide range of concentration ratios. For a 50% O
2
-50% Ar mixture,a resolution(
R
s
) of 1.50 was achieved,indicating a good separation degree. While for a 95% O
2
-5% Ar mixture,although the separation was more challenging,an
R
s
value of 1.14 was still obtained,and in both cases,the total analysis time were within 5 minutes,which demonstrate the high efficiency of this method. Furthermore,a linear external standard calibration curve with a high correlation coefficient(
r
2
>
0.999) was established for argon quantification,validated using an oxygen-rgon mixture gas with an argon volume ratio concentration of 3%. Verification tests were conducted,and the results showed that the relative deviation between the experimentally measured argon concentrations and the certified reference values was less than 4%. This low relative deviation not only highlights the hig
h precision of the established method but also provides strong support for its reliability in practical applications,ensuring more accurate and reliable nuclear test verification under the CTBT framework.
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