Title: | Contaminants migrating from crossed-linked polyethylene pipes and their effect on drinking water odour |
Author(s): | Kalweit C; Stottmeister E; Rapp T; |
Address: | "Umweltbundesamt (Federal Environment Agency), Heinrich-Heine-Str. 12, 08645 Bad Elster, Germany. Umweltbundesamt (Federal Environment Agency), Heinrich-Heine-Str. 12, 08645 Bad Elster, Germany. Electronic address: Thomas.Rapp@uba.de" |
DOI: | 10.1016/j.watres.2019.06.001 |
ISSN/ISBN: | 1879-2448 (Electronic) 0043-1354 (Linking) |
Abstract: | "The formation potential of contaminants diffusing from cross-linked polyethylene (PE-X) pipes and their impact on the odour of drinking water was determined. Three types of PE-X material, Pe-Xa, PE-Xb and PE-Xc, were extensively assessed by performing migration tests following EN 1420 and EN 12873-1. Migration waters were analysed for their threshold odour number (TON). The same samples were investigated by two gas chromatography-mass spectrometry methods: screening and olfactometry. Most of the PE-X materials failed the German regulation of TON <2 for cold water and TON =4 for warm water. PE-Xb material caused the strongest odour and also released the highest amount of contaminants. Metilox, 7,9-di-tert-butyl-1-oxaspiro(4,5)deca-6,9-diene-2,8-dione, 3,5-di-tert-butyl-4-hydroxybenzaldehyde and 2,6-di-tert-butyl-p-benzoquinone (2,6-DtBQ) were the most often detected substances leaching from the tested plastic materials. However, no odour was perceived for most of these substances. Methyl tert-butyl ether (MtBE) and 2-tert-butylphenol are believed to contribute to the sensory problem in the migration water among other substances such as tert-amyl methyl ether, 2,2,2,5-tetramethyltetrahydrofuran, toluene or xylene. In total ten specific descriptions characterized the odour of the individual contaminants: ethereal, fresh, solvent, sweet, fruity, floral, unsavoury, pungent, aromatic and chemical" |
Keywords: | "*Drinking Water *Methyl Ethers Odorants Polyethylene Toluene *Water Pollutants, Chemical Xylenes Contaminants Gc/ms Migration Odour Olfactometry PE-X pipes Screening;" |
Notes: | "MedlineKalweit, Cynthia Stottmeister, Ernst Rapp, Thomas eng England 2019/06/19 Water Res. 2019 Sep 15; 161:341-353. doi: 10.1016/j.watres.2019.06.001. Epub 2019 Jun 5" |