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谢夫碱型向列高温液晶N,N’-双[对苯基苄叉]a,a’-双对甲苯胺(BPhBT)作为高温气相色谱固定相,对多环芳烃(PAH),特别是其中难分离异构对,具有卓越的分离性能。此类高温液晶在环境化学研究上的应用已为人们所重视,其缺点是分子链中含有的—C=N—键在高温下易为氧和水汽所分解,使柱效降低,寿命缩短。为了解决这一问题,人们采用高纯氮气、氩气或氦气作载气和在柱两端加“SE—柱塞”保护等措施,但仍未
A novel high performance liquid chromatographic phase was used as the stationary phase of benzothiazine a, a’-bis-p-toluidine (BPhBT) Which is difficult to separate heterogeneous pairs, with excellent separation performance. The application of such high temperature liquid crystal in environmental chemistry has drawn great attention. The disadvantage is that the -C = N-bond contained in the molecular chain is easily decomposed by oxygen and water vapor at high temperature, which reduces the column efficiency and shortens the life span. In order to solve this problem, people use high-purity nitrogen, argon or helium as carrier gas and add “SE-plunger” protection on both ends of the column,