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Environ Technol

Title:		Leaching of organic contaminants from storage of reclaimed asphalt pavement
Author(s):		Norin M; Stromvall AM;
Address:		"Department of Geology, Chalmers University of Technology, SE-412 96 Goteborg, Sweden"
Journal Title:		Environ Technol
Year:		2004
Volume:		25
Issue:		3
Page Number:		323 - 340
DOI:		10.1080/09593330409355466
ISSN/ISBN:		0959-3330 (Print) 0959-3330 (Linking)
Abstract:		"Recycling of asphalt has been promoted by rapid increases in both the use and price of petroleum-based bitumen. Semi-volatile organic compounds in leachates from reclaimed asphalt pavement, measured in field samples and in laboratory column test, were analysed through a GC/MS screen-test methodology. Sixteen PAH (polyaromatic hydrocarbons) were also analysed in leachates from the column study. The highest concentrations of semi-volatile compounds, approximately 400 microg l(-1), were measured in field samples from the scarified stockpile. Naphthalene, butylated hydroxytoluene (BHT) and dibutyl phthalate (DBP) were the most dominant of the identified semi-volatiles. The occurrence of these compounds in urban groundwater, also indicate high emission rates and persistent structures of the compounds, making them potentially hazardous. Car exhausts, rubber tires and the asphalt material itself are all probable emission sources, determined from the organic contaminants released from the stockpiles. The major leaching mechanism indicated was dissolution of organic contaminants from the surface of the asphalt gravels. In the laboratory column test, the release of high-molecular weight and more toxic PAH was higher in the leachates after two years than at the commencement of storage. The concentrations of semi-volatiles in leachates, were also several times lower than those from the field stockpile. These results demonstrate the need to follow up laboratory column test with real field measurements"
Keywords:		Butylated Hydroxytoluene/analysis Carbon/analysis Conservation of Natural Resources Dibutyl Phthalate/analysis Environmental Pollution/*analysis Gas Chromatography-Mass Spectrometry Hydrocarbons/*chemistry Naphthalenes/analysis Polycyclic Aromatic Hydroca;
Notes:		"MedlineNorin, Malin Stromvall, A M eng Research Support, Non-U.S. Gov't England 2004/06/05 Environ Technol. 2004 Mar; 25(3):323-40. doi: 10.1080/09593330409355466"