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J Chromatogr A

Title:		Evaluation of the stability of a mixture of volatile organic compounds on sorbents for the determination of emissions from indoor materials and products using thermal desorption/gas chromatography/mass spectrometry
Author(s):		Brown VM; Crump DR; Plant NT; Pengelly I;
Address:		"Institute of Environment and Health (IEH), Cranfield University, Cranfield MK43 0AL, UK. Electronic address: Veronica.Brown@hsl.gsi.gov.uk. Institute of Environment and Health (IEH), Cranfield University, Cranfield MK43 0AL, UK. Health and Safety Laboratory (HSL), Buxton, Derbyshire SK17 9JN, UK"
Journal Title:		J Chromatogr A
Year:		2014
Volume:		20140512
Issue:
Page Number:		1 - 9
DOI:		10.1016/j.chroma.2014.05.011
ISSN/ISBN:		1873-3778 (Electronic) 0021-9673 (Linking)
Abstract:		"The standard method for the determination of volatile organic compounds (VOCs) in indoor and test chamber air (ISO 16000-6:2011) specifies sampling onto the sorbent Tenax TA followed by analysis using thermal desorption/gas chromatography/mass spectrometry (TD/GC/MS). The informative Annex D to the standard suggests the use of multi-sorbent samplers to extend the volatility range of compounds which can be determined. The aim of this study was to investigate the storage performance of Tenax TA and two multi-sorbent tubes loaded with a mixture of nine VOCs of relevance for material emissions testing. The sorbent combinations tested were quartz wool/Tenax TA/Carbograph 5TD and quartz wool/Tenax TA/Carbopack X. A range of loading levels, loading conditions (humidities and air volume), storage times (1-4 weeks) and storage conditions (refrigerated and ambient) were investigated. Longer term storage trials (up to 1 year) were conducted with Tenax TA tubes to evaluate the stability of tubes used for proficiency testing (PT) of material emissions analyses. The storage performance of the multi-sorbent tubes tested was found to be equal to that for Tenax TA, with recoveries after 4 weeks storage of within about 10% of the amounts loaded. No consistent differences in recoveries were found for the different loading or storage conditions. The longer term storage trials also showed good recovery for these compounds, although two other compounds, hexanal and BHT, were found to be unstable when stored on Tenax TA. The results of this study provide confidence in the stability of nine analytes for up to 4 weeks on two multi-sorbent tubes for material emissions testing and the same compounds loaded on Tenax TA sorbent for a recently introduced PT scheme for material emissions testing"
Keywords:		"Air/analysis Air Pollution, Indoor/*analysis Environmental Monitoring/*methods *Gas Chromatography-Mass Spectrometry Gases/analysis Polymers/chemistry Time Volatile Organic Compounds/*chemistry Material emissions Multi-sorbent Proficiency testing Storage;"
Notes:		"MedlineBrown, Veronica M Crump, Derrick R Plant, Neil T Pengelly, Ian eng Research Support, Non-U.S. Gov't Netherlands 2014/06/01 J Chromatogr A. 2014 Jul 11; 1350:1-9. doi: 10.1016/j.chroma.2014.05.011. Epub 2014 May 12"