Stability of reactive low boiling hydrocarbons on carbon based adsorbents typically used for adsorptive enrichment and thermal desorption
Stability of reactive low boiling hydrocarbons on carbon based adsorbents typically used for adsorptive enrichment and thermal desorption
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DOI：
10.1007/s002160050014
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发表时间：
2000-01-01
期刊：
影响因子：
--
通讯作者：
Engewald, W
中科院分区：
文献类型：
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作者：
Dettmer, K;Knobloch, T;Engewald, W
在评价空气采样方法的背景下，进行实验室实验以研究吸附在四种不同的碳基吸附剂上的十一种选定的低沸点烃（例如1，3-丁二烯、异戊二烯）的稳定性。测试碳分子筛Carboxen 569、Carboxen 1003、Carbosieve SIII和石墨化炭黑Carbotrap X。通过在惰性气体下经由样品环将供试化合物加载到吸附管中，检查储存持续时间对分析物回收率的影响。此外，使用一个简单的实验装置，提供了一个流的合成空气中掺入的碳氢化合物的采样的碳氢化合物连续从空气中回收的分析物的影响进行了研究。通过热解吸和毛细管气相色谱法对负载的吸附剂管进行分析。对于碳分子筛，观察到高达80%的1，3-丁二烯和异戊二烯损失，甚至在取样步骤后立即发生。相比之下，Carbotrap X在7天的储存时间内未检测到这些反应性成分的显著损失。实验室调查证实了在现场实验。
In the context of evaluating air sampling methods, laboratory experiments were performed to investigate the stability of eleven selected low boiling hydrocarbons (e.g. 1,3-butadiene, isoprene) adsorbed on four different carbon based adsorbents. The carbon molecular sieves Carboxen 569, Carboxen 1003, Carbosieve SIII and the graphitized carbon black Carbotrap X were tested. The influence of storage duration on the recovery of the analytes was examined by loading the adsorbent tubes with the test compounds via a sample loop under inert gas. Furthermore, the influence of sampling the hydrocarbons continuously from air on the recovery of the analytes was investigated using a simple experimental set-up providing a flow of synthetic air spiked with the hydrocarbons. Analysis of the loaded adsorbent tubes was performed by thermal desorption and capillary gas chromatography. Losses up to 80% of 1,3-butadiene and isoprene were observed for the carbon molecular sieves, occurring even immediately after the sampling step. In contrast, no significant losses of these reactive constituents were detected for Carbotrap X over a storage time of seven days. The laboratory investigations were confirmed in a field experiment.