Greally Brian R, Nickless Graham, Simmonds Peter G
School of Chemistry, University of Bristol, Cantocks Close, Bristol BS8 1TS, UK.
J Chromatogr A. 2006 Nov 10;1133(1-2):49-57. doi: 10.1016/j.chroma.2006.08.031. Epub 2006 Aug 30.
The retention behaviour of several gaseous fluorinated greenhouse gases on carbon-based adsorbents is presented. Retention, calculated on the basis of compound breakthrough volume (BTV), is dependent on the molecular composition of the adsorbate, with compounds possessing chlorine or polarizable hydrogens being better retained than those possessing higher fluorine content. Of the adsorbents tested the carbon molecular sieves (CMSs) of highest surface area show greater retention than those with lower area. Retention of fluorocarbons is generally higher on activated charcoals but this adsorbent type can cause irreversible retention, possible degradation and is more difficult to use practically due to its heterogeneous composition. These breakthrough volume results can be used to determine the best combination and quantities of each adsorbent that can be used within a preconcentration device with a view to developing an analytical system for the determination of fluorocarbon gases in low concentration air samples.
本文介绍了几种气态氟化温室气体在碳基吸附剂上的保留行为。基于化合物穿透体积（BTV）计算得出的保留率取决于被吸附物的分子组成，含有氯或可极化氢的化合物比含氟量更高的化合物保留得更好。在所测试的吸附剂中，比表面积最高的碳分子筛（CMS）比表面积较低的碳分子筛表现出更大的保留率。氟碳化合物在活性炭上的保留率通常更高，但这种吸附剂类型可能会导致不可逆保留、可能的降解，并且由于其成分不均一，实际使用起来更加困难。这些穿透体积结果可用于确定预浓缩装置中每种吸附剂的最佳组合和用量，以期开发出一种用于测定低浓度空气样品中氟碳气体的分析系统。
