~ 022212 Study Finds Risk to Children from Coal-Tar Sealants

~ 022212 Study Finds Risk to Children from Coal-Tar Sealants
Chicago Tribune

CHICAGO -- Children living next to driveways or parking lots coated with coal tar are exposed to significantly higher doses of cancer-causing chemicals than those living near untreated asphalt, according to a study that raises new questions about commonly used pavement sealants.

Researchers from Baylor University and the U.S. Geological Survey also found that children living near areas treated with coal-tar-based sealants ingest twice as many polycyclic aromatic hydrocarbons (PAHs) from contaminated dust tracked into their homes as they do from food.

The peer-reviewed study, and other new research documenting how coal-tar sealants emit high levels of troublesome chemicals into the air, comes as several cities in the Midwest, South and East are trying to ban the products' use on playgrounds, parking lots and driveways. Some major retailers have pulled the products from their shelves, but coal-tar sealants remain widely available elsewhere.

"There's been a long-held assumption that diet is the major source of exposure for children," said Peter Van Metre, a USGS scientist who co-authored the studies. "But it turns out that dust ingestion is a more significant pathway."

About 85 million gallons of coal-tar-based sealants are sold in the United States every year, mostly east of the Mississippi River, according to industry estimates. The sealants, promoted as a way to extend the life of asphalt and brighten it every few years with a fresh black sheen, are sprayed by contractors or spread by homeowners.

During the past decade, studies have identified coal-tar sealants as a major source of PAHs, toxic chemicals that can cause cancer and other health problems. Pavement sealants made with coal tar can contain as much as 50 percent PAHs by weight, substantially more than alternatives made with asphalt.

Anne LeHuray, executive director of the Pavement Coatings Technology Council, an industry trade group, said she was reviewing the new findings.

"It appears they have some other agenda here, which is to ban coal-tar-based pavement sealants," she said of the government scientists.

LeHuray and other industry representatives have argued that vehicle exhaust, wood smoke and grilled hamburgers are more significant sources of the toxic chemicals than coal tar.

But the latest USGS research estimates that annual emissions of PAHs from the application of coal-tar-based sealants exceed the amount from vehicle exhaust. Two hours after application, emissions were 30,000 times higher than those from unsealed pavement, one of the new studies found. Parking lots with 3- to 8-year-old sealant released 60 times more PAHs to the air than parking lots without sealant.

The studies are published in the scientific journals Chemosphere, Atmospheric Environment and Environmental Pollution.

------

(c)2012 the Chicago Tribune

Visit the Chicago Tribune at www.chicagotribune.com

Distributed by MCT Information Services

Copyright Chicago Tribune 2012

Copied from office.microsoft.com Clip Art and Image Library


Related Products and Information


Free Shipping in the Continental U.S. on Orders over $50
The statements made here have not been evaluated by the FDA. The foregoing statements are based upon sound and reliable studies, and are meant for informational purposes. Consult with your medical practitioner to determine the underlying cause of your symptoms. Please always check your purchase for possible allergins and correct dosage on the bottle before use.

While we work to ensure that product information is correct, on occasion manufacturers may alter their ingredient lists. Actual product packaging and materials may contain more and/or different information than that shown on our Web site. We recommend that you do not solely rely on the information presented and that you always read labels, warnings, and directions before using or consuming a product. For additional information about a product, please contact the manufacturer. Content on this site is for reference purposes and is not intended to substitute for advice given by a physician, pharmacist, or other licensed health-care professional. You should not use this information as self-diagnosis or for treating a health problem or disease. Contact your health-care provider immediately if you suspect that you have a medical problem. Information and statements regarding dietary supplements have not been evaluated by the Food and Drug Administration and are not intended to diagnose, treat, cure, or prevent any disease or health condition. Life Ex Online assumes no liability for inaccuracies or misstatements about products.