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Parking lot sealcoat: An unrecognized source of urban polycyclic aromatic hydrocarbons

Environmental Science & Technology

By:
, , , , and
https://doi.org/10.1021/es0501565

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Abstract

Polycyclic aromatic hydrocarbons (PAHs) are a ubiquitous contaminant in urban environments. Although numerous sources of PAHs to urban runoff have been identified, their relative importance remains uncertain. We show that a previously unidentified source of urban PAHs, parking lot sealcoat, may dominate loading of PAHs to urban water bodies in the United States. Particles in runoff from parking lots with coal-tar emulsion sealcoat had mean concentrations of PAHs of 3500 mg/kg, 65 times higher than the mean concentration from unsealed asphalt and cement lots. Diagnostic ratios of individual PAHs indicating sources are similar for particles from coal-tar emulsion sealed lots and suspended sediment from four urban streams. Contaminant yields projected to the watershed scale for the four associated watersheds indicate that runoff from sealed parking lots could account for the majority of stream PAH loads.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Parking lot sealcoat: An unrecognized source of urban polycyclic aromatic hydrocarbons
Series title:
Environmental Science & Technology
DOI:
10.1021/es0501565
Volume:
39
Issue:
15
Year Published:
2005
Language:
English
Publisher:
ACS Publications
Description:
7 p.
First page:
5560
Last page:
5566