Volatilization of polycyclic aromatic hydrocarbons from coal-tar-sealed pavement

Metre, Peter C. Van; Majewski, Michael S.; Mahler, Barbara J.; Foreman, William T.; Braun, Christopher L.; Wilson, Jennifer T.; Burbank, Teresa L.

doi:10.1016/j.chemosphere.2011.12.072

Cited by 15 publications

(14 citation statements)

References 35 publications

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“…Prior studies have determined various routes of PAH loss from sealcoated pavement, including volatilization, 5,40 runoff, 36 and abrasion, 3 among others. 6 …”

Section: Resultsmentioning

confidence: 99%

Identification and Toxicological Evaluation of Unsubstituted PAHs and Novel PAH Derivatives in Pavement Sealcoat Products

Titaley

Chlebowski

Truong

et al. 2016

Environ. Sci. Technol. Lett.

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Pavement sealcoat products contain high concentrations of unsubstituted polycyclic aromatic hydrocarbons (PAHs), but the assessment of the potential toxicological impact is limited without the inclusion of PAH derivatives. This study determined the concentrations of 23 unsubstituted PAHs, 11 high molecular weight-PAHs (MW302-PAHs), and 56 PAH derivatives, including 10 methyl-PAHs (MPAHs), 10 heterocyclic-PAHs (Hetero-PAHs), 26 nitrated-PAHs (NPAHs), and 10 oxygenated-PAHs (OPAHs) in coal-tar and asphalt based sealcoat products and time point scrapes. Inclusion of MW302-PAHs resulted in an increase of 4.1–38.7% in calculated benzo[a]pyrene-carcinogenic equivalent (B[a]Peq) concentrations for the coal-tar based products. Increases in some NPAH and OPAH concentrations were measured after application, suggesting the possibility of photochemical transformation of unsubstituted PAHs. The Ames assay indicated that the asphalt based product was not mutagenic, but the coal-tar based sealcoat products were. The zebrafish developmental toxicity tests suggested that fractions where NPAHs and OPAHs eluted have the most significant adverse effects.

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“…Prior studies have determined various routes of PAH loss from sealcoated pavement, including volatilization, 5,40 runoff, 36 and abrasion, 3 among others. 6 …”

Section: Resultsmentioning

confidence: 99%

Identification and Toxicological Evaluation of Unsubstituted PAHs and Novel PAH Derivatives in Pavement Sealcoat Products

Titaley

Chlebowski

Truong

et al. 2016

Environ. Sci. Technol. Lett.

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“…They include eight coal- and traffic- related profiles based on a comprehensive compilation (Li et al, 2003), an industrial boiler profile that represents the average of four boiler types (heavy oil, diesel, heavy oil + natural gas and coke oven gas + blast furnace gas) (Li et al, 1999), and a fireplace combustion profile for burning pine wood (Schauer et al, 2001). Two profiles for coal-tar sealed pavement dust were also included: the mean profile across six cities (Minneapolis, MN; Chicago, IL; Detroit, MI; Washington, D.C.; New Haven, CT and Austin, TX), and the Chicago profile (Van Metre et al, 2008). All of these profiles used PAH measurements in the particulate phase except the boiler profile, which included both vapor and particulate phases.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, coal-tar pavement sealants have been identified as an important source of PAHs in urban waterways, especially in central and eastern U.S. (Van Metre and Mahler, 2010). Sealed pavements also emit PAHs by volatilization to urban air (Van Metre et al, 2012). …”

Section: Introductionmentioning

confidence: 99%

PAHs (polycyclic aromatic hydrocarbons), nitro-PAHs, and hopane and sterane biomarkers in sediments of southern Lake Michigan, USA

Huang

Chernyak

Batterman

2014

Science of The Total Environment

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PAHs in the Great Lakes basin are of concern due to their toxicity and persistence in bottom sediments. Their nitro derivatives, nitro-PAHs (NPAHs), which can have stronger carcinogenic and mutagenic activity than parent PAHs, may follow similar transport routes and also are accumulated in sediments. Limited information exists regarding the current distribution, trends and loadings of these compounds, especially NPAHs, in Lake Michigan sediments. This study characterizes PAHs, NPAHs, and biomarkers steranes and hopanes in surface sediments collected at 24 offshore sites in southern Lake Michigan. The ΣPAH14 (sum of 14 compounds) ranged from 213 to 1291 ng/g dry weight (dw) across the sites, levels that are 2 to 10 times lower than those reported 20 to 30 years earlier. Compared to consensus-based sediment quality guidelines, PAH concentrations suggest very low risk to benthic organisms. The ΣNPAH5 concentration ranged from 2.9 to 18.6 ng/g dw, and included carcinogenic compounds 1-nitropyrene and 6-nitrochrysene. ΣSterane6 and ΣHopane5 concentrations ranged from 6.2 to 36 and 98 to 355 ng/g dw, respectively. Based on these concentrations, Lake Michigan is approximately receiving 11, 0.16, 0.25 and 3.6 metric tons per year (t/yr) of ΣPAH14, ΣNPAH5, ΣSterane6 and ΣHopane5, respectively. Maps of OC-adjusted concentrations display that concentrations decline with increasing off-shore distance. The major sources of PAHs and NPAHs are pyrogenic in nature, based on diagnostic ratios. Using chemical mass balance models, sources were apportioned to emissions from diesel engines (56±18%), coal power plants (27±14%), coal-tar pavement sealants (16±11%), and coke ovens (7±12%). The biomarkers identify a combination of petrogenic and biogenic sources, with the southern end of the lake more impacted by petroleum. This first report of NPAHs levels in sediments of Lake Michigan reveals several carcinogenic compounds at modest concentrations, and a need for further work to assess potential risks to aquatic organisms.

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“…Airborne emissions and stray dust from coal tar–based sealers, one of the two main types of products used to coat certain asphalt pavements, may be a more significant human health threat than previously thought, according to three new studies and a review published by U.S. government and university researchers 1 , 2 , 3 , 4 . The findings build on previous research on coal tar–based sealers (mostly on environmental impacts via runoff and other pathways) and provide novel insights on pathways of human exposure and the magnitude and duration of the emissions.…”

mentioning

confidence: 99%

“…In another of the studies, conducted during a central Texas summer, researchers evaluated airborne PAH emissions from sealed and unsealed parking lots 2 . During the hottest part of the day they found that average concentrations of eight PAHs about an inch above the surface were 19 times greater for the coal tar–treated lots than for unsealed lots, and were 5 times greater about four feet above the surface 2 .…”

mentioning

confidence: 99%

Studies Raise Questions about Pavement Sealers

Weinhold¹

2012

Environ Health Perspect

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Volatilization of polycyclic aromatic hydrocarbons from coal-tar-sealed pavement

Cited by 15 publications

References 35 publications

Identification and Toxicological Evaluation of Unsubstituted PAHs and Novel PAH Derivatives in Pavement Sealcoat Products

Identification and Toxicological Evaluation of Unsubstituted PAHs and Novel PAH Derivatives in Pavement Sealcoat Products

PAHs (polycyclic aromatic hydrocarbons), nitro-PAHs, and hopane and sterane biomarkers in sediments of southern Lake Michigan, USA

Studies Raise Questions about Pavement Sealers

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