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Chemical characterization of laboratory simulated road paving-like asphalt fume generated by gas chromatography-mass spectrometry and high performance liquid chromatography-fluorescence techniques.

Law-B; Stone-S; Frazer-D; Siegel-P
American Industrial Hygiene Conference and Exposition, May 21-26, 2005, Anaheim, California. Fairfax, VA: American Industrial Hygiene Association, 2005 May; :69
Workers in the paving and roofing industry are potentially exposed to asphalt fumes. Asphalt fume composition varies dependent on source of asphalt and application temperature. Polyaromatic hydrocarbon (PAH) content is of particular interest due to potential carcinogenic effects. The characterization of asphalt fume poses technical analytical problems. First and foremost it is a complex mixture. It is very difficult to identify and measure the small quantities of specific PAHs in such complex mixtures. A degree of isolation/separation must be achieved to quantify individual compounds from asphalt fumes. Many methods have been used to evaluate asphalt fume composition, however, they have involved either multiple, difficult steps and/or lack specificity to the point that a confident chemical identification is not possible. The method used in this study utilizes a polyvinyl dibenzyl (PVDB) high performance liquid chromatographic (HPLC) column to separate aliphatics from the PAHs with subsequent analysis using gas chromatography - mass spectrometry (GC-MS). The PVDB-HPLC method can also, potentially, be used to quantify the total amount of PAHs by differential fluorometric detection following class separation by the column. A significant reduction in background interferences of the laboratory-generated asphalt fume extracts has been achieved following simple HPLC-single fraction collection that allows GC-MS identification and quantification. In-line fluorescent analysis of the PAH fraction may also provide total PAH quantification, however, comparability to established, accepted total PAH fluorescent measurement following solid phase extraction has not yet been assessed. In conclusion this HPLC preparatory method is simple and its utility for analysis of specific PAHs has been demonstrated using asphalt fume generated under simulated road paving conditions.
Asphalt-fumes; Asphalt-industry; Asphalt-concretes; Fumes; Gas-chromatography; Mass-spectrometry; Workers; Roofing-industry; Occupational-exposure; Exposure-levels; Aromatic-hydrocarbons; Carcinogenicity; Carcinogenesis; Carcinogens
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Disease and Injury: Asthma and Chronic Obstructive Pulmonary Disease
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American Industrial Hygiene Conference and Exposition, May 21-26, 2005, Anaheim, California