On-column cryofocusing and analyte enrichment device for gas chromatography systems
On-column cryofocusing and analyte enrichment device for gas chromatography systems
复制标题
用于气相色谱系统的柱上冷冻聚焦和分析物富集装置
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
E. Naujalis
中科院分区：
文献类型：
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作者：
Audrius Sadaunykas;Audrius Zolumskis;Audrius Markevičius;E. Naujalis
立陶宛，Vilnius, 02300, savanoriu Avenue, 231，国家物理科学与技术研究中心计量系。本工作的目的是设计、构建和测试气相色谱样品聚焦浓缩装置。该装置基于四个金属环，其中放置了一个毛细管柱和两个线加热器。金属环相互连接，并用液氮冷却。柱通过加热传输线连接到气相色谱系统。研究了冷却柱长度对系统聚焦和富集能力的影响。结果发现，通过使用较长的冷却部分，分析物可以更好地聚焦。较长的冷却柱也能够保留更大体积的分析物，连续注入。通过使用95 cm的冷却柱长度，可以保留20个注射剂，并检测到20倍大的峰面积。通过改变冷却区的温度，还观察到峰对称在很大程度上依赖于它。较低的冷却区温度产生更窄和更对称的峰。
Metrology Department, State Research Institute Center for Physical Sciences and Technology, 231 Savanorių Avenue, 02300 Vilnius, Lithuania The objective of this work was to design, construct and test the sample focusing and concentration enrichment device for gas chromatography. The device was based on four metal rings, between which a capillary column and two wire heaters were placed. The metal rings were connected to each other and cooled down using liquid nitrogen. The column was connected to the gas chromatography system using a heated transfer line. The research was conducted on how the length of the cooled column influences focusing and enrichment capabilities of the system. It was found that the analytes were focused better by using a longer cooled part of the column. The longer cooled column was also able to retain a greater volume of the analytes, injected consecutively. By using the 95 cm cooled column length, it was possible to retain 20 injections and detect a 20 times bigger peak area. By changing the temperature of the cooling zone, it was also observed that peak symmetry is heavily dependent on it. Lower cooled zone temperatures produced narrower and more symmetrical peaks.