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Special ES&T issue examines effects of emerging contaminants on people, planet

ions, often infiltrate ground water near aerospace facilities. However, Valentine Nzengung, Ph.D., and colleagues at the University of Georgia found that pre-rooted trees, such as willows and poplars that soak up tremendous amounts of water, effectively removed up to 94 percent of the NDMA in 50 days and 100 percent of the perchlorate in 70 days, at concentration ranges found in most ground water. The study is the first to suggest a cost-effective way to use plants and trees to manage the spread of groundwater contaminated with NDMA or NDMA and perchlorate, Nzengung says.

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Carbon nanotube byproducts could impact key food source for shrimp, fish

Byproducts produced during the manufacture of single-walled carbon nanotubes appear to have a disruptive effect on copepods, a group of small crustaceans, which are a critical food source for shrimp, crabs and fish in coastal rivers and estuaries, according to Thomas Chandler, Ph.D., and colleagues at the University of South Carolina. Copepods exposed to these impurities, called fluorescent nanocarbon byproducts, took longer to reach maturity, had more reproductive problems and had higher mortality rates than copepods that weren't exposed to these compounds. Single-walled carbon nanotubes, which are about 80,000 times thinner than a human hair and are used in electronic equipment and sporting goods, had no adverse effects on copepods in this study. The findings suggest that nanoscale manufacturing byproducts could upset coastal food chains if released into rivers and estuaries, the researchers say. These byproducts, they add, should be monitored or
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Contact: Michael Bernstein
m_bernstein@acs.org
202-872-4400
American Chemical Society
30-Nov-2006


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