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  • 2009
  • U.S.Environmental Protection Agency awards SPEA researchers $5 million for Great Lakes project

U.S.Environmental Protection Agency awards SPEA researchers $5 million for Great Lakes project

Monday, October 26, 2009

The U.S. Environmental Protection Agency has awarded Indiana University a $5 million grant to continue a project that measures levels of airborne toxic chemicals being deposited in the Great Lakes.

The Integrated Atmospheric Deposition Network (IADN) project is led at IU by Ronald Hites, Distinguished Professor, and by Ilora Basu, a research scientist in the School of Public and Environmental Affairs. The project began in 1990 under an agreement between the U.S. EPA and Environment Canada. Indiana University has been in charge of the U.S. portion of the study since 1994. The grant announced today continues the project for five years.

"Atmospheric deposition is one of the main ways that toxic chemicals get into the Great Lakes," said Gary Gulezian, director of the EPA's Great Lakes National Program Office. "IADN is a critical long-term Great Lakes monitoring program that not only estimates the loadings of these chemicals to the Great Lakes, but also tracks environmental progress and identifies potential source regions."

Hites said the grant will enable IU to provide important trend data on chemicals -- including polychlorinated biphenyls (PCBs), chlorinated pesticides such as DDT, polycyclic aromatic hydrocarbons and brominated fire retardants -- reaching the Great Lakes through the atmosphere.

"We also want to nail down something that we've seen in the last couple of years -- namely, the huge impact that cities have," Hites said. "Cities are clearly where the sources of the chemicals are, and they're leaking out into the lakes."

The IADN project involves collecting air samples at regular intervals at master stations on each of the five Great Lakes and at several satellite stations. The U.S., through Indiana University, is responsible for master stations on Lakes Michigan, Superior and Erie and satellite stations in Chicago and Cleveland. Canada focuses on Lakes Huron and Ontario.

The Great Lakes are the largest surface freshwater system on the Earth, containing about 84 percent of North America's surface fresh water and about 21 percent of the world's supply. Roughly 10 percent of the U.S. population and more than 30 percent of Canada's population live in the Great Lakes basin.

For IADN, air samples are taken every 12 days, providing a mass of data that allow scientist s to study trends in the deposition of chemicals to the Great Lakes and that help policy makers better understand how to manage the effects of pollution. "Just a few measurements over a few months don't tell you much," Hites said. "You've got to do these measurements continuously over a long time period."

While concentrations of some of these chemicals in the air are low, many do not easily break down. They are persistent, and they bioaccumulate in the tissues of animals. For many people, consumption of fish and wildlife is the primary pathway for exposure to the chemicals. As a result, government agencies continue to issue advisories against eating Great Lakes fish.

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