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J Chromatogr A

Title:		Storage stability of ketones on carbon adsorbents
Author(s):		Prado C; Alcaraz MJ; Fuentes A; Garrido J; Periago JF;
Address:		"Instituto de Seguridad y Salud Laboral, Apartado 35, E-30120 El Palmar, Region de Murcia, Murcia, Spain. celiaa.prado@carm.es"
Journal Title:		J Chromatogr A
Year:		2006
Volume:		20060718
Issue:		1
Page Number:		82 - 87
DOI:		10.1016/j.chroma.2006.06.078
ISSN/ISBN:		0021-9673 (Print) 0021-9673 (Linking)
Abstract:		"Activated coconut carbon constitutes the more widely used sorbent for preconcentration of volatile organic compounds in sampling workplace air. Water vapour is always present in the air and its adsorption on the activated carbon surface is a serious drawback, mainly when sampling polar organic compounds, such as ketones. In this case, the recovery of the compounds diminishes; moreover, ketones can be decomposed during storage. Synthetic carbons contain less inorganic impurities and have a lower capacity for water adsorption than coconut charcoal. The aim of this work was to evaluate the storage stability of various ketones (acetone, 2-butanone, 4-methyl-2-pentanone and cyclohexanone) on different activated carbons and to study the effect of adsorbed water vapour under different storage conditions. The effect of storage temperature on extraction efficiencies was significant for each ketone in all the studied sorbents. Recovery was higher when samples were stored at 4 degrees C. The results obtained for storage stability of the studied ketones showed that the performance of synthetic carbons was better than for the coconut charcoals. The water adsorption and the ash content of the carbons can be a measure of the reactive sites that may chemisorb ketones or catalize their decomposition. Anasorb 747 showed good ketone stability at least for 7 days, except for cyclohexanone. After 30-days storage, the stability of the studied ketones was excellent on Carboxen 564. This sorbent had a nearly negligible ash content and the adsorbed water was much lower than for the other sorbents tested"
Keywords:		Acetone/analysis/chemistry Adsorption Air Pollutants/analysis Butanones/analysis/chemistry Carbon/*chemistry Cyclohexanones/analysis/chemistry Ketones/analysis/*chemistry Pentanones/analysis/chemistry Temperature Time Factors Water/chemistry;
Notes:		"MedlinePrado, C Alcaraz, M J Fuentes, A Garrido, J Periago, J F eng Netherlands 2006/07/19 J Chromatogr A. 2006 Sep 29; 1129(1):82-7. doi: 10.1016/j.chroma.2006.06.078. Epub 2006 Jul 18"