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Anal Chim Acta

Title:		Simulation of the breakthrough behavior of volatile organic compounds against sorbent tube sampler as a function of concentration level and sampling volume
Author(s):		Kim KH; Lee MH; Szulejko JE;
Address:		"Department of Civil & Environmental Engineering, Hanyang University, Seoul 133-791, Republic of Korea. Electronic address: kkim61@hanyang.ac.kr. Department of Civil & Environmental Engineering, Hanyang University, Seoul 133-791, Republic of Korea"
Journal Title:		Anal Chim Acta
Year:		2014
Volume:		20140529
Issue:
Page Number:		46 - 55
DOI:		10.1016/j.aca.2014.05.042
ISSN/ISBN:		1873-4324 (Electronic) 0003-2670 (Linking)
Abstract:		"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 ~100% (AA) >/= 85% (PA) >/= 45% (BA) >/= 30% (VA and IVA). There is good correlation between ST-2 recovery vs. carbon number for >CO 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 gas-phase/sorbent partition coefficient is large"
Keywords:		Gases/*analysis Polymers/*analysis Volatile Organic Compounds/*analysis Aromatic Breakthrough Sorbent tube Thermal desorption Volatile organic compounds;
Notes:		"MedlineKim, Ki-Hyun Lee, Min-Hee Szulejko, Jan E eng Research Support, Non-U.S. Gov't Netherlands 2014/06/24 Anal Chim Acta. 2014 Jul 4; 835:46-55. doi: 10.1016/j.aca.2014.05.042. Epub 2014 May 29"