Coal Tar Based Pavement Sealcoat and PAHs

Coal-Tar-Based Pavement Sealcoat, PAHs, and ... - usgs.gov

Coal-tar-based sealcoat is a potent source of PAHs and related chemicals. Worn particles of coal-tar-based sealcoat are transported by rain, wind, tires, and even our feet from pavement to other environmental settings. Sealcoat product (A), after it dries, gradually abrades to a powder and becomes part of the dust on the pavement (B).

Coal-Tar-Based Pavement Sealcoat, Polycyclic Aromatic ...

dust from unsealed pavement. • Coal-tar-based sealcoat is the largest source of PAH contamination to 40 urban lakes studied, accounting for one-half of all PAH inputs. • Coal-tar-based sealcoat use is the primary cause of upward trends in PAHs, since the 1960s, in urban lake sediment. • Residences adjacent to parking lots with coal-tar ...

Coal-Tar-Based Pavement Sealcoat and PAHs: Implications ...

Mar 20, 2012 · Coal-tar-based sealcoat products, widely used in the central and eastern U.S. on parking lots, driveways, and even playgrounds, are typically 20−35% coal-tar pitch, a known human carcinogen that contains about 200 polycyclic aromatic hydrocarbon (PAH) compounds.

Cited by: 93

Coal-Tar Based Pavement Sealcoat, PAHs, and …

Coal‐tar‐based pavement sealcoat, PAHs, and Environmental Contamination . Polycyclic aromatic hydrocarbons (PAHs) are ... Coal ‐ tar ‐ based pavement sealcoat. HighPAH concentrations? Use is extensive? Documented off‐sitetransport? ... Coal-Tar Based Pavement Sealcoat, PAHs, and Environmental Contamination Author: US EPA, OW, OWM ...

Coal-Tar-Based Pavement Sealcoat and PAHs: …

PAHs from coal-tar-based pavement sealcoat are transported by different pathways to various environmental compartments. Once dry, the sealcoat product (A), which contains high concentrations of PAHs, is abraded into a powder and becomes part of the dust on the pavement (B).

Cited by: 93

Coal-Tar-Based Pavement Sealcoat, PAHs, and ... - in.gov

Coal-Tar-Based Pavement Sealcoat, PAHs, and Environmental Health 1 . What are PAHs and why do we care? •Toxic to aquatic life and to mammals •Cause tumors and mutations •Cause birth defects •Seven are probable human carcinogens (EPA B2 carcinogens) •16 are EPA Priority Pollutants 2

Coal-Tar Sealcoat, Polycyclic Aromatic Hydrocarbons, …

Coal-Tar Sealcoat, Polycyclic Aromatic Hydrocarbons, and Stormwater Pollution Minimum Measure. Pollution Prevention/Good Housekeeping. What Is Coal-Tar Sealcoat? Coal-tar sealcoat is a type of sealant used to maintain and protect driveway and parking lot asphalt pavement. Coal-tar . sealcoat typically contains 20 to 35% coal tar pitch, a byproduct

USGS Research: PAHs and Coal-Tar-Based Pavement Sealcoat

Coal-tar-based pavement sealant is a potent source of polycyclic aromatic hydrocarbons (PAHs), as documented by the USGS and other researchers. Coal-tar-based sealcoat products typically are 20 to 35% coal tar or coal-tar pitch—these materials are known human carcinogens that contain high ...

Coal-Tar-Based Pavement Sealcoat—Potential …

PAH Levels in Asphalt-Based and Coal-Tar-Based Sealcoat. Pavement sealcoat is a commercial product that is applied to many asphalt parking lots, driveways, and playgrounds in North America in an effort to protect and beautify the underlying asphalt. It rarely is used on public roads.

Coal-tar-based sealcoated pavement: A major PAH …

Coal-tar-based sealcoat Polycyclic aromatic hydrocarbons Urban sprawl Streams Land use abstract We used land-use analysis, PAH concentrations and assemblages, and multivariate statistics to identify sediment PAH sources in a small (w1303 km2) urbanizing …

Coal-Tar-Based Pavement Sealcoat, PAHs, and ... - in.gov

Coal-Tar-Based Pavement Sealcoat, PAHs, and Environmental Health 1 . What are PAHs and why do we care? •Toxic to aquatic life and to mammals •Cause tumors and mutations •Cause birth defects •Seven are probable human carcinogens (EPA B2 carcinogens) •16 are EPA Priority Pollutants 2

Concentrations of polycyclic aromatic hydrocarbons (PAHs ...

Coal-tar-based sealcoat, used extensively on parking lots and driveways in North America, is a potent source of PAHs. We investigated how concentrations and assemblages of PAHs and azaarenes in runoff from pavement newly sealed with coal-tar-based (CT) or asphalt-based (AS) sealcoat …

Coal-tar-based pavement sealcoat—Potential concerns for ...

Sealcoat is the black, viscous liquid sprayed or painted on many asphalt parking lots, driveways, and playgrounds to protect and enhance the appearance of the underlying asphalt. Studies by the U.S. Geological Survey (USGS), academic institutions, and State and local agencies have identified coal-tar-based pavement sealcoat as a major source of polycyclic aromatic hydrocarbon (PAH ...

Coal-Tar-Based Pavement Sealcoat: Health and …

PAHs in parking lot dust: comparison of west (asphalt-based sealcoat) and east (coal-tar-based sealcoat) Unsealed pavement dust Asphalt Coal tar 8.5 <8.6 0.83 54 24 21 47 30 Van Metre et al., 2009, Environ. Sci. & Tech. 8 Sealed pavement dust

Polycyclic Aromatic Hydrocarbons, Coal-Tar Sealcoat, …

Title: Polycyclic Aromatic Hydrocarbons, Coal-Tar Sealcoat, and Stormwater Pollution Author: US EPA, OW, OWM, Water Permits Division Subject: Communicate to stakeholders the high concentrations of PAHs in coal-tar sealcoat, a commonly used sealant for driveways and parking lots.

A Discussion of Coal Tar Versus Asphalt Based Sealcoats ...

Coal Tar based sealcoats have traditionally been seen as the standard for asphalt sealcoating east of the Rockies. The main component of the first sealed roads, coal tar was formerly used as one of the primary component of pavement surfaces, when mixed with ironworks slag.

Coal tar - Wikipedia

Coal tar is a complex mixture of phenols, polycyclic aromatic hydrocarbons (PAHs), and heterocyclic compounds. It is a keratolytic agent, which reduces the growth rate of skin cells and softens the skin's keratin. Composition. Coal tar is produced through thermal destruction of coal.

Coal-Tar Sealants and PAH Contamination - Tip of the Mitt ...

Coal-tar-based pavement sealant is the largest source of polycyclic aromatic hydrocarbons (PAHs) found in 40 urban lakes studied by the U.S. Geological Survey (USGS). Asphalt-based sealcoat runoff can contain 10 times more PAHs than an uncoated driveway and the amount of PAHs in stormwater runoff in parking lots sealed with coal-tar sealants ...

Coal-Tar-Based Parking Lot Sealcoat: An Unrecognized ...

Feb 01, 2010 · A recently identified outdoor source of PAHs to the environment (16,17)—coal-tar-based pavement sealcoat—has not been considered in any previous investigations of PAHs in SHD. Sealcoat is the black liquid that is sprayed or painted on the asphalt pavement of many parking lots, driveways, and playgrounds in the U.S. and Canada in an attempt ...

Coal Tar-Based Asphalt Sealcoats - A Health and ...

Nov 08, 2012 · LaVista and Mahler, Coal Tar Sealcoats a Major Source of PAHs to Air and to Children Living Nearby, United States Geological Survey, February 13, 2012 . Mahler et al, Coal Tar-Based Pavement Sealcoat and PAHs: Implications for the Environment, Human Health, and Stormwater Management, Environmental Science and Technology (2012), Vol. 46, 3039-3045