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Evaluation of surrogate standards for GC/MS quantitation of asphalt fume condensate.

Law-B; Stone-S; Frazer-D; Siegel-P
American Industrial Hygiene Conference and Exposition, May 13-16, 2006, Chicago, Illinois. Fairfax, VA: American Industrial Hygiene Association, 2006 May; :56
Asphalt is a complex mixture of aliphatics, polycyclic aromatic hydrocarbons, substituted aromatic compounds, and other miscellaneous compounds. Several methods of quantification have been used to assess fume concentration for industrial hygiene studies. These include benzene-extractable components weight from gravimetric sampling, fluorescent assessment for polyaromatic hydrocarbon (PAH) content, and total fume concentration relative to PAH or kerosene. Finding an appropriate standard to quantify this type of mixture can be difficult, resulting in potential gross quantitative underestimation or overestimation. In the present study, road paving-like asphalt fume-was generated (150 degrees C), collected onto a sampling train consisting of a HEPA filter (particulate phase) followed by XAD-2 (volatile phase), and both were extracted with dichloromethane. Density of the particulate phase was 1.84 g/ml. Kerosene, standard mixture containing 16 priority PAH compounds, and aliphatic standards (C8-C36) were evaluated by gas chromatograph-mass spectrometry (GC-MS) for similarity of simulated boiling point profiles, and relative total ions vs. asphalt fume extracts. Fluorescence methods were also evaluated before and after HPLC separation from aliphatic components using a poly-divinylbenzene column. Fluorescence was found to be problematic for the quantification of total PAHs from this complex mixture. The kerosene reference standards' boiling point profile was closer to that of the asphalt fume than the other standards evaluated. The total asphalt fume particulate concentration was overestimated (using GC-MS analyses) by 16.7-, 1.8- and 1.7-fold using the PAH mixture, the kerosene reference standard, and the aliphatic reference standard mix respectively. These results underscore the difficulty in assessing and quantifying the concentration of complex mixtures from occupational environments.
Asphalt-fumes; Fumes; Fumigants; Industrial-hygiene; Gravimetric-analysis; Asphalt-industry; Asphalt-concretes; Asphalt-cements; Gas-chromatography; Mass-spectrometry; Sampling; Sampling-methods; Polycyclic-aromatic-hydrocarbons
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Disease and Injury: Asthma and Chronic Obstructive Pulmonary Disease
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American Industrial Hygiene Conference and Exposition, May 13-16, 2006, Chicago, Illinois