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J Water Health

Title:		Long-term study of migration of volatile organic compounds from cross-linked polyethylene (PEX) pipes and effects on drinking water quality
Author(s):		Lund V; Anderson-Glenna M; Skjevrak I; Steffensen IL;
Address:		"Division of Environmental Medicine, Department of Water Hygiene, Norwegian Institute of Public Health, PO Box 4404 Nydalen, NO-0403 Oslo, Norway. vidar.lund@fhi.no"
Journal Title:		J Water Health
Year:		2011
Volume:		9
Issue:		3
Page Number:		483 - 497
DOI:		10.2166/wh.2011.165
ISSN/ISBN:		1477-8920 (Print) 1477-8920 (Linking)
Abstract:		"The objectives of this study were to investigate migration of volatile organic compounds (VOCs) from cross-linked polyethylene (PEX) pipes used for drinking water produced by different production methods, and to evaluate their potential risk for human health and/or influence on aesthetic drinking water quality. The migration tests were carried out in accordance with EN-1420-1, and VOCs were analysed by gas chromatography-mass spectrometry. The levels of VOC migrating from new PEX pipes were generally low, and decreasing with time of pipe use. No association was found between production method of PEX pipes and concentration of migration products. 2,4-di-tert-butyl phenol and methyl tert-butyl ether (MTBE) were two of the major individual components detected. In three new PEX pipes, MTBE was detected in concentrations above the recommended US EPA taste and odour value for drinking water, but decreased below this value after 5 months in service. However, the threshold odour number (TON) values for two pipes were similar to new pipes even after 1 year in use. For seven chemicals for which conclusions on potential health risk could be drawn, this was considered of no or very low concern. However, odour from some of these pipes could negatively affect drinking water for up to 1 year"
Keywords:		Drinking Water/analysis/*chemistry Environmental Exposure/*analysis Gas Chromatography-Mass Spectrometry Manufactured Materials Methyl Ethers/*analysis Norway Odorants Polyethylene/chemistry Risk Assessment Volatile Organic Compounds/*analysis Water Pollu;
Notes:		"MedlineLund, Vidar Anderson-Glenna, Mary Skjevrak, Ingun Steffensen, Inger-Lise eng Research Support, Non-U.S. Gov't England 2011/10/07 J Water Health. 2011 Sep; 9(3):483-97. doi: 10.2166/wh.2011.165"