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From toxic dust and algae to ill winds from Africa
Date:11/20/2009

isms, can cause tumors in fish, and several are believed to cause cancer in humans. In this study, researchers examined five sources of PAHs in 40 urban lakes from across the United States, including coal-tar-based pavement sealcoat, coal combustion, oil combustion, vehicle emissions and wood combustion. Of the five sources studied, sealcoat was the strongest contributor to PAH contamination in lake sediment. This research can help those trying to reduce pollution levels in the urban environment by providing them with a better understanding of PAH sources. This study, Sources of PAHs to urban lakes in the United States, will be presented on Nov. 23 at 11:20 a.m. in the Jefferson Room. For more information, contact Peter Van Metre at pcvanmet@usgs.gov or at 512-927-3506.

Tiny particles with big effects: Industrially produced nanoparticles are being dispersed into the environment from a range of everyday human activities. Use of consumer nanoproducts, such as sunscreen with zinc oxide or bed sheets and socks containing silver nanoparticles, all have the potential to release metals into the environment. Some of these particles can be toxic, but little is known about how nanoparticles will accumulate in the environment. Interactions between nanoparticles and living organisms are influenced by the unique physico-chemical properties of each kind of nanoparticle. This study introduces a new approach to evaluate the toxicity of nanoparticles with metal as an ingredient, and offers a way to begin to understand potential beneficial uses and potential environmental risks. This study, Characterizing the bioavailability and toxicity of engineered nanoparticles using enriched isotope tracers and biodynamic modeling, will be presented on Nov. 22 at 10 a.m. in the Oak Alley Room. For more information, contact Marie-Noele Croteau at mcroteau@usgs.gov or at 650-329-4424.

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Contact: Kara Capelli
kcapelli@usgs.gov
703-648-5086
United States Geological Survey
Source:Eurekalert

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