摘 要

本文建立一种以电化学气体传感器为检测器，简单净化空气为载气的气相色谱系统，其中电化学气体传感器选型为环氧乙烷传感器，色谱仪采用SP-6890型气相色谱仪。通过所建立的该系统对混合气样（CO、C₂H₄、C₂H₂）进行色谱分离实验，综合考察了色谱柱温度和色谱柱前压两个关键色谱参数对色谱分离效果的影响，并研究了高纯空气和环境空气分别作为载气时的基线差异和色谱分离效果。实验表明：色谱柱前压的改变对组分出峰速度及分离效果有很大影响，柱前压太大分离效果差，柱前压太小出峰速度慢，分析时间长。并最终确认了最佳色谱柱前压为0.08Mpa；色谱柱温度的改变对分离效率的影响显著，色谱柱温度升高，其分离效率快速增大，但同时其分离效果在达到一定温度后会下降。并最终确认了最佳色谱柱温度为60℃；在用高纯空气和环境空气分别作为载气时，两种载气对色谱基线及色谱分离效果的影响并无较大差异。

关键词：气相色谱系统；电化学气体传感器；色谱分离

Development of Gas Chromatography System with Air as Carrier Gas

Abstract

This paper proposes a gas chromatographic system using an electrochemical gas sensor as a detector, a simple air purifier as a carrier gas, and a gas six-way valve as an injector. The electrochemical gas sensor is selected as ethylene oxide. Sensors, chromatograms using SP-6890 gas chromatograph. The chromatographic separation experiments of the mixed gas samples (CO, C₂H₄, C₂H₂) were performed using the established system. Two key chromatographic parameters, the chromatographic column temperature and the column pressure, were compared. The effect of the separation effect and the baseline differences and chromatographic separation effects of high purity air and ambient air as carrier gases were investigated. The experiment shows that: the change of the column pressure has a great influence on the peak speed and the separation effect of the components. The pre-column pressure is too large, the separation effect is poor, the column front pressure is too small, the peak speed is slow, and the analysis time is long. And finally confirmed that the optimum column pressure is 0.08Mpa; the change of the column temperature has a significant effect on the separation efficiency, the column temperature increases, the separation efficiency increases rapidly, but at the same time the separation effect will reach a certain temperature decline. Finally, it was confirmed that the optimum column temperature was 60°C; when high-purity air and ambient air were used as the carrier gas, there was no significant difference in the effect of the two carrier gases on the baseline and chromatographic separation.

Key words: gas chromatography system; electrochemical gas sensor; chromatographic separate.

目 录

摘要 I

Abstract II

目 录 III

第一章 绪论 1

1.1 色谱法简介 1

1.2 气相色谱法简介 1

1.3 气相色谱系统简介 3

1.4 气相色谱检测器及电化学气体传感器简介 5

1.4.1 气相色谱检测器 5

1.4.2 电化学气体传感器 6

1.5 本论文的主要研究目标与内容介绍 7

1.5.1 研究目标 7

1.5.2 内容介绍 7

第二章 实验设计 8

2.1 实验器材 8

2.2 实验装置的建立 8

2.2.1 载气系统 8

2.2.2 进样系统 9

2.2.3 检测系统 10

2.3 实验方法 11

2.3.1色谱柱前压对色谱分离的影响 11

2.3.2 色谱柱温度对色谱分离的影响 11

2.3.3 不同载气对基线及色谱分离的影响 11

2.4 实验操作步骤 11

2.5 本章小结 12

第三章 色谱分离实验研究 14

3.1 色谱柱前压对分离效果的影响 14

3.2 色谱柱温度对分离效果的影响 17

3.3 不同载气对基线及分离效果的影响 20

3.4 本章小结 22

第四章 结论与展望 23

4.1 结论 23

4.2 展望 23

参考文献 24

致谢 26

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