Featured Research

from universities, journals, and other organizations

Children at risk for ingestion of PAHs from pavement sealant, study finds

Date:
February 13, 2012
Source:
Baylor University
Summary:
Children living near coal-tar-sealed pavement are likely to receive a far higher dose of carcinogenic polycyclic aromatic hydrocarbons from incidental ingestion of house dust than do children living near unsealed pavement, and that dose is more than two times higher than the PAH dose children are estimated to receive from food.

Old asphalt, not recently sealed. Coal-tar-based pavement sealant, a product applied to many parking lots, driveways, and even playgrounds primarily in the Central, Southern, and Eastern U.S., has PAH concentrations 100 to 1,000 times greater than most other PAH sources.
Credit: Imageman Rez / Fotolia

Children living near coal-tar-sealed pavement are likely to receive a far higher dose of carcinogenic polycyclic aromatic hydrocarbons (PAHs) from incidental ingestion of house dust than do children living near unsealed pavement, and that dose is more than two times higher than the PAH dose children are estimated to receive from food.

In a paper published in the journal Environmental Pollution, researchers at Baylor University in Waco, Texas, and the U.S. Geological Survey (USGS) in Austin, Texas, reported that the calculated non-dietary dose of B2 (carcinogenic) PAHs for children in residences adjacent to coal-tar-sealed pavement is 14 times that for children in residences adjacent to unsealed pavement.

The results are an important step in evaluating the human-health risk associated with use of coal-tar-sealcoat products.

"Our study indicates that house dust in residences adjacent to coal-tar-sealed pavement might represent a primary and biologically relevant exposure to B2 PAHs, especially in young children. This is of particular interest because of the widespread use of coal-tar-based sealant on parking lots and residential driveways in the U.S.," said E. Spencer Williams., Ph.D., principal author of the study and Baylor University assistant research scientist at the Center for Reservoir and Aquatic Systems Research in the College of Arts & Sciences.

Coal-tar-based pavement sealant, a product applied to many parking lots, driveways, and even playgrounds primarily in the Central, Southern, and Eastern U.S., has PAH concentrations 100 to 1,000 times greater than most other PAH sources. An earlier study documented that house dust in residences adjacent to coal-tar-sealed parking lots had PAH concentrations 25 times higher than in house dust in residences adjacent to parking lots with other types of surfaces.

Humans regularly are exposed to PAHs through ingestion of cooked and uncooked foods, incidental ingestion of soil and dust, inhalation of ambient air and absorption through skin. While some previous studies have indicated that diet is the most important source of PAHs to humans, those studies did not consider house dust contaminated with PAHs from coal-tar-based sealcoat.

"Until now, common knowledge held that dietary ingestion was the most important way that children are exposed to PAHs, but these dose calculations challenge that assumption for some settings," added Barbara Mahler, also an author of the exposure study and a researcher with the USGS.


Story Source:

The above story is based on materials provided by Baylor University. Note: Materials may be edited for content and length.


Journal Reference:

  1. E. Spencer Williams, Barbara J. Mahler, Peter C. Van Metre. Coal-tar pavement sealants might substantially increase children's PAH exposures. Environmental Pollution, 2012; 164: 40 DOI: 10.1016/j.envpol.2012.01.010

Cite This Page:

Baylor University. "Children at risk for ingestion of PAHs from pavement sealant, study finds." ScienceDaily. ScienceDaily, 13 February 2012. <www.sciencedaily.com/releases/2012/02/120213134140.htm>.
Baylor University. (2012, February 13). Children at risk for ingestion of PAHs from pavement sealant, study finds. ScienceDaily. Retrieved September 1, 2014 from www.sciencedaily.com/releases/2012/02/120213134140.htm
Baylor University. "Children at risk for ingestion of PAHs from pavement sealant, study finds." ScienceDaily. www.sciencedaily.com/releases/2012/02/120213134140.htm (accessed September 1, 2014).

Share This




More Health & Medicine News

Monday, September 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Get on Your Bike! London Cycling Popularity Soars Despite Danger

Get on Your Bike! London Cycling Popularity Soars Despite Danger

AFP (Sep. 1, 2014) Wedged between buses, lorries and cars, cycling in London isn't for the faint hearted. Nevertheless the number of people choosing to bike in the British capital has doubled over the past 15 years. Duration: 02:27 Video provided by AFP
Powered by NewsLook.com
We've Got Mites Living In Our Faces And So Do You

We've Got Mites Living In Our Faces And So Do You

Newsy (Aug. 30, 2014) A new study suggests 100 percent of adult humans (those over 18 years of age) have Demodex mites living in their faces. Video provided by Newsy
Powered by NewsLook.com
Liberia Continues Fight Against Ebola

Liberia Continues Fight Against Ebola

AFP (Aug. 30, 2014) Authorities in Liberia try to stem the spread of the Ebola epidemic by raising awareness and setting up sanitation units for people to wash their hands. Duration: 00:41 Video provided by AFP
Powered by NewsLook.com
California Passes 'yes-Means-Yes' Campus Sexual Assault Bill

California Passes 'yes-Means-Yes' Campus Sexual Assault Bill

Reuters - US Online Video (Aug. 30, 2014) California lawmakers pass a bill requiring universities to adopt "affirmative consent" language in their definitions of consensual sex, part of a nationwide drive to curb sexual assault on campuses. Linda So reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins