分析测试学报2025，Vol.44Issue(11)：2403-2407,5.DOI:10.12452/j.fxcsxb.25021489
基于气相色谱的氧氩分离及氩定量分析方法研究
Research on the Method for Oxygen and Argon Separation and Argon Quantitative Analysis Based on Gas Chromatography
摘要
Abstract
The presence of 37Ar,produced via 40Ca(n,α)37Ar during nuclear 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.Howev-er,residual oxygen in samples,which has nearly identical physical properties to argon,is difficult to remove completely,causing errors in argon volume and 37Ar quantification,compromising verifica-tion reliability and potentially leading to false compliance conclusions.To address this oxygen-argon separation analytical challenge,this study systematically investigated the separation efficiency of oxy-gen and argon mixtures using gas chromatography(GC).Key operational parameters including col-umn 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％O2-50％Ar mixture,a resolution(R)of 1.50 was achieved,indicating a good separation degree.While for a 95％O2-5％Ar mixture,although the separation was more challenging,an R 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(r2＞0.999)was established for argon quantification,validated using an oxy-gen-rgon mixture gas with an argon volume ratio concentration of 3％.Verification tests were conduct-ed,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 on-ly highlights the high precision of the established method but also provides strong support for its reli-ability in practical applications,ensuring more accurate and reliable nuclear test verification under the CTBT framework.关键词
37Ar/气相色谱/氧氩分离/氩定量分析Key words
37Ar/gas chromatography/oxygen-argon separation/argon quantitative analysis分类
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马梦瑶,安少杭,刘蜀疆,盛毓强,常印忠,陈占营,李奇,王世联..基于气相色谱的氧氩分离及氩定量分析方法研究[J].分析测试学报,2025,44(11):2403-2407,5.基金项目
国家自然科学基金资助项目(12205126) （12205126）
