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J Chromatogr A

Title:		Challenges of fast sampling of volatiles for thermal desorption gas chromatography - mass spectrometry
Author(s):		Marcillo A; Weiss BM; Widdig A; Birkemeyer C;
Address:		"Research Group of Mass Spectrometry, Institute of Analytical Chemistry, Faculty of Chemistry and Mineralogy, University of Leipzig, Linnestr. 3, 04103 Leipzig, Germany. Research Group of Behavioral Ecology, Institute of Biology, Faculty of Life Sciences, University of Leipzig, Talstr. 33, 04103 Leipzig, Germany; Research Group 'Primate Behavioural Ecology('), Department of Human Behaviour, Ecology and Culture, Max-Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany. Research Group of Behavioral Ecology, Institute of Biology, Faculty of Life Sciences, University of Leipzig, Talstr. 33, 04103 Leipzig, Germany; Research Group 'Primate Behavioural Ecology('), Department of Human Behaviour, Ecology and Culture, Max-Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany; German Center for Integrative Biodiversity Research (iDiv), Deutscher Platz 5E, 04103 Leipzig, Germany. Research Group of Mass Spectrometry, Institute of Analytical Chemistry, Faculty of Chemistry and Mineralogy, University of Leipzig, Linnestr. 3, 04103 Leipzig, Germany. Electronic address: birkemeyer@chemie.uni-leipzig.de"
Journal Title:		J Chromatogr A
Year:		2020
Volume:		20191221
Issue:
Page Number:		460822 -
DOI:		10.1016/j.chroma.2019.460822
ISSN/ISBN:		1873-3778 (Electronic) 0021-9673 (Linking)
Abstract:		"Fast active sampling of volatile organic compounds (VOCs) under field conditions still is a great challenge especially when the exposure time to the source of emissions is a restricting factor. Hence, to identify ideal conditions for such applications, we systematically compared fast active sampling of VOCs collected on two common adsorbents under two regimes: first, very low gas volumes (from 300?ª+mL) sampled at nominal flow rate and, second, sampling at the maximal applicable flow rate (0.5?ª+L/min) before loss of sorbent material was experienced. For XAD-2 and Tenax TA, efficient sorbents for on-site VOC-sampling followed by thermal desorption GC-MS, significant differences in the signal response of volatile compounds were related not only to the varied experimental factors alone, but also to their interactions and to compound volatility. In the first regime, volatiles ( approximately 0.004-3.13?ª+mM) from Tenax TA gave the highest signal response only above 800?ª+mL sampled gas volume while at low concentrations ( approximately 0.004-0.12?ª+mM), satisfactory recovery from XAD-2 required longer analyte-sorbent interaction. For the second regime, the relative recovery was severely impaired down to 73?ª++/-?ª+23%, n?ª+=?ª+56 for Tenax TA and 72?ª++/-?ª+17%, n?ª+=?ª+56 for XAD-2 at intermediate concentration, and 79?ª++/-?ª+11%, n?ª+=?ª+84 for Tenax TA at high concentration compared to the relative recovery at standard flow rate. Neither Tenax TA nor XAD-2 provided a 100% total recovery (calculated using breakthrough values) for any of the evaluated compounds. Finally, two-way and three-way interactions identified in a multi-variable model, explained not only the dependence of the signal response on different experimental variables, but also their complex interplay affecting the recovery of the VOCs. In conclusion, we show for the first time that XAD-2, a material only recently introduced for the adsorption of volatiles from the gas phase, competes well with the standard material Tenax TA under conditions of fast sampling. Due to the similar absolute recovery with Tenax TA even at low concentration and with regard to the better detection limits, we consider XAD-2 the better choice for fast sampling of VOCs, particularly with low sample volumes at regular flow. For fast sampling with high flow rate, however, both sorbents might be selected only if the corresponding recovery loss can be accepted for the study"
Keywords:		Adsorption Gas Chromatography-Mass Spectrometry/*methods Polymers Temperature Volatile Organic Compounds/*analysis Fast sampling Field sampling Short time exposure Thermal desorption GC-MS;
Notes:		"MedlineMarcillo, Andrea Weiss, Brigitte M Widdig, Anja Birkemeyer, Claudia eng Netherlands 2020/01/14 J Chromatogr A. 2020 Apr 26; 1617:460822. doi: 10.1016/j.chroma.2019.460822. Epub 2019 Dec 21"