Am. Kito et al., EMISSIONS OF VOLATILE AND SEMIVOLATILE ORGANIC-COMPOUNDS AND PARTICULATE MATTER FROM HOT ASPHALTS, Environmental technology, 18(2), 1997, pp. 121-138
Asphalts are widely used in paving of roads, and water-proof sealing o
f building roofs, tanks and containers. This study evaluated the quali
tative and quantitative characteristics of emissions from hot asphalts
and bitumen that included reactive organic gases (ROGs) and particula
te matter (PM). The ROGs consisted of several volatile organic compoun
ds (VOCs), and semi-volatile organic compounds (SVOCs) of environmenta
l concern. The latter included several polynuclear aromatic hydrocarbo
ns (PAHs) and alkanes. An experimental laboratory testing, sampling an
d analysis protocol was developed for obtaining efficient and cost eff
ective a priori estimates of asphalt emissions. The investigation iden
tified and quantified the emissions of organics and evaluated the magn
itudes as well as particle size distributions of PM emissions. The stu
dy demonstrated that the asphalt type and temperature greatly affected
the emission characteristics, and that several organic compounds emit
ted were partitioned between gaseous and particulate phases. The facto
rs that affected the phase distribution of organic compounds included
the following: vapor pressures, ambient temperatures, collection metho
ds, stability and reactivity, and affinity for sorption on PM.