| 气相色谱法测定大气中的CO、CO2以及低级烃类物质 |
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| 基金项目:中国科学院仪器功能开发项目(2015gw05) |
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| 中文摘要:建立了运用气相色谱对大气中一氧化碳、二氧化碳以及3种低级烃类甲烷、乙烯和乙炔进行同时分析的方法。气相色谱分析系统由自动进样器、1个十通阀协同1个六通阀，以及1个十通阀协同1个四通阀组成，可以实现进样、分离和反吹功能。HP-PLOT Q开口毛细管柱用于5种气体的分离，柱后连接热导检测器；分离完成后，一氧化碳和二氧化碳通过甲烷转化炉中的镍催化作用转化为甲烷，用氢火焰离子化检测器进行检测。5种目标分析物在9 min内完全分离。一氧化碳、甲烷、二氧化碳、乙烯以及乙炔的线性范围分别为3.3~4 990.0、3.3~5 010.0、6.6~4 990.0、4.2~5 080.0、3.9~5 030.0 μmol/mol，检出限为1.0~2.0 μmol/mol，相关系数不低于0.997，相对标准偏差(RSD,n=5)不大于3.5%。该方法简单、准确，可操作性强。 |
| 中文关键词:温室气体 开口毛细管柱 气相色谱 大气 乙烯 乙炔 |
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| Determination of CO，CO2 and Light Hydrocarbons in Air by Gas Chromatography |
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| Abstract:A method was developed for the simultaneous determination of carbon monoxide，carbon dioxide and three light hydrocarbons i.e.methane，ethylene and acetylene in air by gas chromatography.The GC system consisted of auto-injection，one ten-port valve together with a six port valve and one ten-port valve in series with a four-port valve.Sample injection，column isolation and column back-flushing were realized in this way mentioned.An HP-PLOT Q open tubular capillary column was employed for the separation of the five gases followed by thermal conductivity detection.After the separation was completed，carbon monoxide and carbon dioxide were converted into methane with the use of a nickel-based methanizer for the detection by flame ionization.Separation of all the target analytes was achieved in one single analysis within 9 min.Carbon monoxide，methane，carbon dioxide，ethylene and acetylene were found to be linear over the ranges of 3.3-4 990.0，3.3-5 010.0，6.6-4 990.0，4.2-5 080.0,3.9-5 030.0 μmol/mol，respectively.The correlation coefficients were not less than 0.997 with the detection limits of 1.0-2.0 μmol/mol.Reproducibility of two levels，namely std1 and std2 were found to be not more than 3.5%(n= 5).This method was simple，accurate and maneuverable. |
| Key Words:greenhouse gas open tubular capillary columns gas chromatography air ethylene acetylene |
| 引用本文：张丽萍，王久荣，陈闻，耿梅梅，袁红朝，李春勇，彭灿，许丽卫.气相色谱法测定大气中的CO、CO2以及低级烃类物质[J].分析测试学报,2017,36(9):1119-1123. |
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