Characterization of asphalt fume generation system.
Wang J; Frazer DG; Tomblyn S; Stone A; Afshari B; Zhong Z; Lewis DM; Siegel PD
Toxicologist 2000 Mar; 54(1):351
A dynamic asphalt fume generation system (Heritage Research Group, Indianapolis, IN) was modified to provide consistent test atmospheres emulating road asphalt paving conditions. Characterization of the asphalt fume test atmospheres included (1) identification and characterization of chemical composition of polycyclic aromatic hydrocarbons (PAHs) by gas chromatography-mass spectometry (GC-MS) of asphalt fume fractions collected by TPFE filter (0.5 um pore size at a flow rate of 1.0 liters/min), XAD-2, charcoal, and cold trap (-190 C, liquid N2); (2) determination of the asphalt fume generation system uniformity of the aerosol distribution within the generator and exposure chamber; (3) gravimetric analysis (4) use of photoionization detector (PID) for the vapor phase and a light scattering aerosol monitor for on-line monitoring of chamber concentration; and (5) detection and minimization of interferences from insulation and gasket materials, within the system. The asphalt was originally preheated in an oven to 170 C, pumpted to a large bitumen kettle, which maintained the asphalt temperature at between 150-170 C and then transferred to the generator (inlet temperature of 145-150 C). The fume was then conducted from the generator to an exposure chamber through a heated transfer line.
Asphalt fumes; Chemical composition; Polycyclic aromatic hydrocarbons; Gas chromatography; Mass spectrometry; Aerosols; Exposure chambers; Gravimetric analysis; Monitoring systems; Sampling methods; Qualitative analysis; Quantitative analysis
The Toxicologist. Society of Toxicology 39th Annual Meeting, March 19-23, 2000, Philadelphia, Pennsylvania