Bruno Thomas J, Lewandowska Aneta, Tsvetkov Faina, Miller Keith E, Hanley Howard J M
Physical and Chemical Properties Division, National Institute of Standards and Technology, Boulder, CO 80305, USA.
J Chromatogr A. 2002 Oct 11;973(1-2):143-9. doi: 10.1016/s0021-9673(02)01124-x.
Wall-coated open-tubular (WCOT) column chromatography is shown to be a viable tool to measure hydrocarbon interactions with an organo-clay as the stationary phase. In this paper, we report the heats of interaction for a series of hydrocarbons (n-alkanes of C6-C12, and cyclohexane) on a cetyltrimethylammonium bromide (CTAB)-modified Laponite-RD clay. The measurements were performed with a new WCOT method that we have developed, and also a conventional packed-column approach. Although the measurements from both techniques yield the same values of enthalpy (on the basis of our statistical analysis), we argue that WCOT column chromatography gave the more reliable results, with lower uncertainties and better chromatographic behavior.
壁涂开管（WCOT）柱色谱法被证明是一种可行的工具，可用于测量以有机粘土为固定相时烃类之间的相互作用。在本文中，我们报告了一系列烃类（C6 - C12的正构烷烃和环己烷）在十六烷基三甲基溴化铵（CTAB）改性的锂皂石-RD粘土上的相互作用热。测量是使用我们开发的一种新的WCOT方法以及传统的填充柱方法进行的。尽管两种技术的测量结果在焓值上相同（基于我们的统计分析），但我们认为WCOT柱色谱法给出的结果更可靠，不确定性更低且色谱行为更好。
