Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany.
J Chromatogr A. 2010 Mar 26;1217(13):2065-9. doi: 10.1016/j.chroma.2010.01.078. Epub 2010 Feb 2.
Halogens are known to play an important role in the tropospheric ozone-depletion chemistry and are of special interest because of their influence on the atmospheric oxidation capacity. In this paper, we investigate the application of a capillary diffusion technique for the generation of gaseous halogen standards like Br(2), IBr, ICl and I(2). The influence of capillary dimension (i.e. length and inner diameter), ambient pressure and headspace volume of the diffusion vessel on the test gas output has been evaluated. The experimental output rates are determined from the mass loss of the analyte vessel on a regular schedule and compared with their respective theoretical predictions. We also demonstrate that a 1,3,5-trimethoxybenzene-coated diffusion denuder is capable of collecting gaseous ICl quantitatively, which provides an attractive alternative for the rapid determination of the output of test gas devices. The output rates of ICl measured by the denuder method are in close agreements with the data obtained by the gravimetric method.
卤素在对流层臭氧消耗化学中起着重要作用，由于它们对大气氧化能力的影响而受到特别关注。在本文中，我们研究了一种毛细管扩散技术在生成气态卤素标准品（如 Br(2)、IBr、ICl 和 I(2)）方面的应用。评估了毛细管尺寸（即长度和内径）、环境压力和扩散容器的顶空体积对测试气体输出的影响。通过定期测量分析物容器的质量损失来确定实验输出率，并将其与各自的理论预测进行比较。我们还证明，1,3,5-三甲氧基苯涂层的扩散阱能够定量收集气态 ICl，这为快速测定测试气体装置的输出提供了一种有吸引力的替代方法。通过阱方法测量的 ICl 输出率与通过重量法获得的数据非常吻合。
