Document Detail

Watershed-based sources of polycyclic aromatic hydrocarbons in urban storm water.
MedLine Citation:
PMID:  16519297     Owner:  NLM     Status:  MEDLINE    
Polycyclic aromatic hydrocarbons (PAHs) are carcinogenic and mutagenic compounds, ubiquitous in the air and water of urban environments, and have been shown to accumulate in coastal estuarine and marine sediments. Although previous studies have documented concentrations and loads of PAHs in urban runoff, little is known about the sources and temporal patterns of PAH loading from storm water. This study characterized the sources and temporal patterns of PAHs in urban storm water by analyzing PAH concentrations and loads from a range of homogeneous land use sites and in-river mass emission sites throughout the greater Los Angeles, California, USA, region. Samples were collected at 30- to 60-min intervals over the course of a storm during multiple storm events over a four-year period in order to investigate PAH sources and inter- and intrastorm patterns in loading. Polycyclic aromatic hydrocarbon storm fluxes ranged from 1.3 g/km2 for the largely undeveloped Arroyo Sequit watershed to 223.7 g/km2 for the highly urbanized Verdugo Wash watershed, with average storm fluxes being 46 times higher in developed versus undeveloped watersheds. Early-season storms repeatedly produced substantially higher loads than comparably sized late-season storms. Within individual storms, PAHs exhibited a moderate first flush with between 30 and 60% of the total PAH load being discharged in the first 20% of the storm volume. The relative distribution of individual PAHs demonstrated a consistent predominance of high-molecular-weight compounds indicative of pyrogenic sources.
Eric D Stein; Liesl L Tiefenthaler; Kenneth Schiff
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental toxicology and chemistry / SETAC     Volume:  25     ISSN:  0730-7268     ISO Abbreviation:  Environ. Toxicol. Chem.     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-03-07     Completed Date:  2006-06-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8308958     Medline TA:  Environ Toxicol Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  373-85     Citation Subset:  IM    
Southern California Coastal Water Research Project, 7171 Fenwick Lane, Westminster, CA 92688, USA.
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MeSH Terms
Environmental Monitoring
Molecular Weight
Polycyclic Hydrocarbons, Aromatic / analysis*
Time Factors
Water Pollutants, Chemical / analysis*
Water Supply*
Reg. No./Substance:
0/Polycyclic Hydrocarbons, Aromatic; 0/Water Pollutants, Chemical

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