Many Toxics Program investigations include or focus directly on the occurrence, transport and ecological effects of nutrients in the environment. The major nutrients nitrogen and phosphorus typically are studied; however, this research includes any process or chemicals that enrich or otherwise affect nutrient budgets in natural as well as anthropogenically affected water resources. Nutrients from agricultural, urban, and other sources are included in these investigations. The information presented on this page cuts across lines drawn by individual investigations and projects so that information on the fate and effects of nutrients can be presented in one place.
Investigations and Research Activities
Fact Sheets
![USGS scientist lowering a water-quality sampler into the Iowa River near Marengo, IA, (site ID 05453100). during the 1993 flood of the upper Mississippi River Watershed. The samples were analyzed for nutrients and pesticides](https://webarchive.library.unt.edu/web/20090506162723im_/http://toxics.usgs.gov/photo_gallery/photos/pesticides/HerbReconn/hr_river_sampling_sm.jpg)
USGS scientist lowering a water-quality sampler into the Iowa River near Marengo, IA, (site ID 05453100). during the 1993 flood of the upper Mississippi River Watershed. The samples were analyzed for nutrients and pesticides
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![Average annual nitrate concentrations in selected rivers during 1905-07 and 1980-96 (FS 135-00)](https://webarchive.library.unt.edu/web/20090506162723im_/http://toxics.usgs.gov/photo_gallery/photos/pesticides/NitrateRiversFig_s.jpg)
Average annual nitrate concentrations in selected rivers during 1905-07 and 1980-96 (FS 135-00)
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Headlines
Bibliography
New Publications
- Fractionation of stable isotopes in perchlorate and nitrate during in situ biodegradation in a sandy aquifer: Hatzinger, P., Böhlke, J.K., Sturchio, N.C., Gu, B., Heraty, L.J., and Borden, R.C., 2009, Environmental Chemistry, v. 6, no. 1, p. 44-52, doi:10.1071/EN09008.
- Multi-scale measurements and modeling of denitrification in streams with varying flow and nitrate concentration in the Upper Mississippi River Basin, USA: Böhlke, J.K., Antweiler, R.C., Harvey, J.W., Laursen, A.E., Smith, L.K., Smith, R.L., and Voytek, M.A., 2009, Biogeochemistry, v. 93, p. 117-141, doi:10.1007/s10533-008-9282-8 (Advanced Web release).
- Effect of grain-coating mineralogy on nitrate and sulfate storage in the unsaturated zone: Reilly, T.J., Fishman, N.S., and Baehr, A.L., 2009, Vadose Zone Journal, v. 8, no. 1, p. 75-85, doi:10.2136/vzj2008.0053.
- Benthic nutrient sources to hypereutrophic Upper Klamath Lake, Oregon: Kuwabara, J.S., Topping, B.R., Lynch, D.D., Carter, J.L., and Essaid, H.I., 2009, Environmental Toxicology and Chemistry, v. 28, no. 3, p. 516-524, doi:10.1897/08-207.1.
- Microbial characterization of nitrification in a shallow, nitrogen-contaminated aquifer, Cape Cod, Massachusetts and detection of a novel cluster associated with nitrifying Betaproteobacteria: Miller, D.N., and Smith, R.L., 2009, Journal of Contaminant Hydrology, v. 103, no. 3-4, p. 182-193, doi:10.1016/j.jconhyd.2008.10.011.
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