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毛细管柱中使用最多的是玻璃毛细管开管柱。但是,玻璃内壁表面光滑,对许多固定液润湿性差。特别是用极性固定液涂渍时,在较高温度下会使液膜很快破裂而形成微滴,致使柱效降低。为此,人们用表面改性来克服这些缺点,表面粗糙化就是其措施之一。它不仅能改善润湿能力,同时也能增加表面积,使柱容加大,且在某种程度上起到消除表面活性点的作用。近年来,国内外在这方面都做了不少工作,国内研制及应用较多的是担体涂层开管柱(简称SCOT柱),和用气态氯化氢腐蚀以制备氯化钠结晶柱。前者已作为商品出售,但不能分析一些特殊体系。后者则对水较敏感。为此,我们在Grob等人工作的基础上进行了BaCO_3柱的研制,并用于分析甲醇合成汽油,一氧化碳合成甲醇及喹啉加氢产物,并与SCOT柱作了比较。一、柱子的制备
The most widely used capillary column is a glass capillary column. However, the interior surface of the glass is smooth and poor wettability with many fixatives. In particular, the use of polar fixative coating, at higher temperatures will rupture the liquid film quickly to form droplets, resulting in reduced efficiency. To this end, people use surface modification to overcome these shortcomings, surface roughening is one of its measures. It not only improves the wetting ability but also increases the surface area, increases the column capacity and, to some extent, eliminates the surface active sites. In recent years, a lot of work has been done in this area at home and abroad. The domestic research and application of more is the open coating column (referred to as SCOT column), and the use of gaseous hydrogen chloride corrosion to prepare sodium chloride crystal column. The former has been sold as a commodity, but can not analyze some special systems. The latter is more sensitive to water. Therefore, based on the work of Grob et al., We developed the BaCO 3 column and used it to analyze the methanol synthesis gasoline, carbon monoxide to synthesize methanol and the hydrogenation products of quinoline, and compared with SCOT column. First, the preparation of the column