References
- Seinfeld J.H.; Pandis, S.P. Atmospheric Chemistry and Physics; John Wiley and Sons: New York, 1998; p 531.
- Penner, J.E.; Atherton, C.S.; Dignon, J.; Ghan, S.J.; Walton, J.J.; Hameed, S. Tropospheric Nitrogen: a Three-Dimensional Study of Sources, Distributions, and Deposition; J. Geophys. Res. 1991, 96, 959–990.
- Walker, J.T.; Aneja, V.P.; Dickey, D.A. Atmospheric Transport and Wet Deposition of Ammonium in North Carolina; Atmos. Environ. 2000, 34, 3407–3418.
- Kendall, C.; Caldwell, E.A. Fundamentals of Isotope Geochemistry. In Isotope Tracers in Catchment Hydrology; Kendall, C., McDonnell, J.J., Eds.; Elsevier: Amsterdam, the Netherlands, 1998; pp 51-86, 203–246.
- Karr, J.D.; Showers, W.; Gilliam, J.W.; Andres, A.S. Tracing Nitrate Transport and Environmental Impact from Intensive Swine Farming Using Delta Nitrogen-15; J. Environ. Qual. 2001, 30, 1163–1175.
- Karr, J.D.; Showers W.J.; Jennings, G.D. Low-Level Nitrate Export from Confined Dairy Farming Detected in North Carolina Streams Using δ15N; Agric. Ecosyst. Environ. 2003, 95, 103–110.
- Schulz, H.; Gehre, M.; Hofmann, D.; Jung, K. Nitrogen Isotope Ratios in Pine Bark as an Indicator of N Emissions from Anthropogenic Sources; Environ. Monitor. Assess. 2001, 69, 283–297.
- Heaton, T.H.E. 15N/14N Ratios of NOx from Vehicle Engines and Coal-Fired Power Stations; Tellus 1991, 42, 304–307.
- Freyer, H.D. Seasonal Variation of 15N/14N Ratios in Atmospheric Nitrate Species; Tellus 43B: pp 30–44, 1991.
- Freyer, H.D.; Kley, D.; Volz-Thomas, A.; Kobel, K. on the Interaction of Isotopic Exchange Processes with Photochemical Reactions in Atmospheric Oxides of Nitrogen; J. Geophys. Res. 1993, 98, 14791–14796.
- Russell, K.M.; Galloway, J.N.; Macko, S.A.; Moody, J.L.; Scudlark, J.R. Sources of Nitrogen in Wet Deposition to the Chesapeake Bay Region; Atmos. Environ. 1998, 32, 2453–2465.
- Hastings, M.G.; Sigman, D.M.; Lipschultz, F. Isotopic Evidence for Source Changes of Nitrate in Rain at Bermuda; J. Geophys. Res. Atmos. 2003, 108, 4790.
- Air Resources Laboratory Frequently Asked Questions; National Oceanic and Atmospheric Administration; available at http://www.arl.noaa.gov/faq/md3.html (accessed October 4, 2005).
- Quality Assurance Support for the NADP; National Atmospheric Deposition Program; available at http://nadp.sws.uiuc.edu/QA/ (accessed January 8, 2008).
- Spoelstra, J.; Schiff, S.L.; Jeffries, D.S.; Semkin, R.G. Effect of Storage on the Isotopic Composition of Nitrate in Bulk Precipitation; Environ. Sci. Technol. 2004, 38, 4723–4727.
- Methods for the Determination of Inorganic Substances in Environmental Samples; 600 R-93 100; U.S. Environmental Protection Agency, Washington, DC, 1993.
- Chang, C.C.Y.; Langston, J.; Riggs, M.; Campbell, D.H.; Silva, S.R.; Kendall C. A. Method for Nitrate Collection for Delta N-15 and Delta O-18 Analysis from Waters with Low Nitrate Concentrations; Can. J. Fish. Aquat. Sci. 1999, 56, 1856–1864.
- Showers, W.J.; Usry, B.; Fountain, M.; Fountain, J.; McDade, T.; De-Master, D. Nitrate Flux from Ground to Surface Waters Adjacent to the Neuse River Waste Water Treatment Plant; Report No. 316; University of North Carolina; Water Resources Research Institute: Raleigh, NC, 2005; p 38.
- Haberhauer, G.; Bolchberger, K. A Simple Cleanup Method for the Isolation of Nitrate from Natural Water Samples for O Isotope Analysis; Anal. Chem. 1999, 71, 3587–3590.
- North Carolina Department of Air Quality Web Site; available at http://daq.state.nc.us/monitor/data/ (accessed October 15, 2005).
- North Carolina State Climate Office Web Site; available at http://www.nc-climate.ncsu.edu/ (accessed November 10, 2005).
- Garten, C.T. Variation in Foliar 15N Abundance and the Availability of Soil Nitrogen on Walker Branch Watershed; Ecology 1992, 74, 2098–2113.
- Thode, H.G.; Urey, H.C. Further Concentration of 15N; J. Am. Chem. Soc. 1939, 7, 34–39.
- Urey, H.C. The Thermodynamic Properties of Isotopic Substances; J. Am. Chem. Soc. 1947, 5, 562–581.
- Yeatman, S.G.; Spokes, L.J.; Dennis, P.F.; Jickells, T.D. Comparisons of Aerosol Nitrogen Isotopic Composition at Two Polluted Coastal Sites; Atmos. Environ. 2001, 35, 1307–1320.