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American Chemical Society's Weekly PressPac -- May 21, 2008
Date:5/26/2008

ARTICLE #1 FOR IMMEDIATE RELEASE

Melting glaciers may release DDT and contaminate Antarctic environment
Environmental Science & Technology

In an unexpected consequence of climate change, scientists are raising the possibility that glacial melting is releasing large amounts of the banned pesticide DDT, which is contaminating the environment in Antarctica. The study is scheduled for the June 1 issue of ACS bi-weekly journal Environmental Science & Technology.

In the study, Heidi N. Geisz and colleagues estimate that up to 2.0-8.8 pounds of DDT are released into coastal waters annually along the Western Antarctic Ice Sheet from glacial meltwater. The researchers point out that DDT reaches Antarctica by long-range atmospheric transport in snow, and then gets concentrated in the food chain. DDT has been banned in the northern hemisphere and has been regulated worldwide since the 1970s. Geisz found, however, that DDT levels in the Adelie penguin have been unchanged since the 1970s, despite an 80 percent reduction in global use.

Global warming may explain that contradiction, they say. As the annual winter temperature on the Antarctic Peninsula has increased by about 10 degrees Fahrenheit in the last 30 years, glaciers have retreated. The possibility that glacial meltwater has contaminated Antarctic organisms with DDT, the study says, has compelling consequences if global warming should continue and intensify. JS

ARTICLE #1 FOR IMMEDIATE RELEASE
Melting Glaciers: A Probable Source of DDT to the Antarctic Marine Ecosystem

DOWNLOAD FULL TEXT ARTICLE
http://dx.doi.org/10.1021/es702919n

CONTACT:
Heidi N. Geisz
College of William and Mary
Gloucester Point, Va. 23062
Phone: (804) 684-7474
Fax: (804) 684-7786
Email: heidig@vims.edu


ARTICLE #
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Contact: Michael Woods
m_woods@acs.org
202-872-4400
American Chemical Society
Source:Eurekalert  

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