Concentrically packed high flow air sampler for parts-per-trillion volatile and semi-volatile organica compounds

X Xie, HD Tolley, ML Lee - Journal of Chromatography A, 2017 - Elsevier
X Xie, HD Tolley, ML Lee
Journal of Chromatography A, 2017Elsevier
Rapid determination of trace level (parts-per-trillion) volatile organic compounds cannot
always be achieved with conventional analytical techniques. In this study, a device was
developed to sample a large volume of air in a short time period. The basic design involves
packing sorbent layers concentrically around an empty permeable tube. Single digit parts-
per-trillion detection limits were reached in less than 25 min with this sampling system using
gas chromatography–mass spectrometry for analysis. The concentric packed trap can …
Abstract
Rapid determination of trace level (parts-per-trillion) volatile organic compounds cannot always be achieved with conventional analytical techniques. In this study, a device was developed to sample a large volume of air in a short time period. The basic design involves packing sorbent layers concentrically around an empty permeable tube. Single digit parts-per-trillion detection limits were reached in less than 25 min with this sampling system using gas chromatography–mass spectrometry for analysis. The concentric packed trap can sample at high flow rates (>10 L/min) because it has a large sampling surface cross-section and short combined sorbent bed. Additionally, the large sorbent amount (>1 g) provides large breakthrough volume (>100 L) required to achieve low detection limits. The trapped analytes were thermally desorbed and transferred into a needle trap device for final analysis. This high flow sampling system was explored for detection of low ppt benzene, toluene, ethylbenzene and xylenes (BTEX) in air.
Elsevier
以上显示的是最相近的搜索结果。 查看全部搜索结果