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

are higher than elsewhere in the world, she said. Toxicology testing suggests that, like PCBs (polybrominated biphenyls), PBDEs may be harmful to humans.

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Noble metal catalysts, trees remove NDMA from ground water

A pair of new remediation techniques could help eliminate NDMA (N-nitrosodimethylamine) from ground and drinking water. NDMA, which is classified as a probable human carcinogen by the Environmental Protection Agency, often forms when water is disinfected with chlorine and especially chloramine. NDMA is difficult to remove from water using conventional methods, but in a laboratory study, Martin Reinhard, Ph.D., and his colleagues at Stanford University and the University of Illinois, Urbana-Champaign, used noble metal catalysts, such as palladium, to destroy NDMA under ambient conditions. When the technology is further developed, the researchers say NDMA concentrations could possibly be reduced to a few parts per trillion. The new process, they note, potentially could be used to treat a broad spectrum of contaminants.

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NDMA also can be formed by oxidation of UDMH (1, 1-dimethylhydrazine), a compound used in rocket fuel production. As a result, NDMA and a co-contaminant, perchlorate, which also is used in rocket fuel and munit
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Contact: Michael Bernstein
m_bernstein@acs.org
202-872-4400
American Chemical Society
30-Nov-2006


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