Hydrogen Sulfide. Hydrogen sulfide (H2S) is a colorless gas with a characteristic odor of rotten eggs. It naturally occurs in the gases from volcanoes, sulfur springs, undersea vents, swamps, stagnant bodies of water, and in crude petroleum and natural gas. Additionally, bacteria, fungi, and actinomycetes release hydrogen sulfide during the decomposition of sulfur-containing proteins and by the...

OBJECTIVES To characterize temperature-dependent emissions from paving and built-up roofing asphalt (BURA) and to quantify differences in temperature-related concentrations and composition. METHODS Using headspace gas chromatography, 18 polycyclic aromatic hydrocarbon (PAH) emission concentrations were quantified over eight temperatures (120-315°C) for paving asphalt (n = 20) and Types II, II...

The National Institute of Standards and Technology (NIST) Center for Building Technology (CBT) and the National Roofing Contractors Association (NRCA) have joined in sponsoring Conferences on Roofing Technology on a biennial basis since 1969. In 1977, NIST and NRCA co-sponsored the First International Symposium on Roofing Technology, and in 1985, they were joined by RILEM' in co-sponsoring the ...

This study sought to evaluate exposure from specific products to evaluate potential risk from roof repair activities. Five asbestos-containing fibered roof coatings and plastic cements, representing a broad range of these types of products, were tested in exposure simulations. These products were applied to representative roof substrates. Release of asbestos fibers during application and sandin...