Journal
ANALYTICA CHIMICA ACTA
Volume 835, Issue -, Pages 46-55Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2014.05.042
Keywords
Volatile organic compounds; Aromatic; Sorbent tube; Breakthrough; Thermal desorption
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [2013-4,624]
Ask authors/readers for more resources
The breakthrough (BT) properties of Tenax TA sorbent were challenged by gaseous standards containing a suite of 13 volatile organic compounds (VOC): (1) aromatic hydrocarbons: benzene (B), toluene (T), p-xylene (p-X), and styrene (S), (2) aldehydes: acetaldehyde (AA), propionaldehyde (PA), butyraldehyde (BA), isovaleraldehyde (IA), and valeraldehyde (VA), (3) ketones: methyl ethyl ketone (MEK) and methyl isobutyl ketone (MIBK), and (4) two others: isobutyl alcohol (i-BuAl) and butyl acetate (BuAc). To this end, 1-3 L of standards (10-50 ppb) were loaded on the two sorbent tubes (ST) connected in series at 100 mL min(-1). The front ST-1 was used for calibration purposes, while the ST-2 for breakthrough (recovery criterion of < 1% with p-xylene as the key datum point). Although aromatic hydrocarbons generally met such criterion, benzene was readily distinguishable with the maximum BT. The BT for the aldehydes exhibited similar to 100% (AA) >= 85% (PA) >= 45% (BA) >= 30% (VA and IVA). There is good correlation between ST-2 recovery vs. carbon number for > C-O entity (aldehydes, ester, and ketones). As such, BT is essentially concentration independent and relatively predictable across different functional groups and between the homologues. However, the BT behavior of ppb level VOCs is no longer consistent for certain species (like benzene or MEK) relative their ppm counterparts. This variation is explained by the Langmuir equation in which the 1/BTV is proportional to analyte gas-phase concentration, if the gasphase/sorbent partition coefficient is large. (C) 2014 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available