Scientific Investigations Report 2007-5048
A stormflow study of natural organic matter and organic contaminants in the Santa Ana River, the Mill Creek tributary, and an urban drain tributary discovered cyanuric acid in variable concentrations up to 510 μg/L. Cyanuric acid was isolated with a hydrophilic natural organic matter (NOM) fraction, and its identity was confirmed by a combination of infrared spectrometry, 13C-nuclear magnetic resonance (13C-NMR) spectrometry, and electrospray ionization/mass spectrometry. Cyanuric acid concentrations, based upon 13C-NMR spectral quantitation, increased during the peak and recessional flows of the storm hydrographs during three storms at three sites. The greatest fluxes of cyanuric acid were observed in the Santa Ana River during the third storm. The most likely source of cyanuric acid is as a metabolite of triazine herbicides, based on hydrographs, land uses of the drainage basins, and the yearly application rates of triazine herbicides. The daily flux of cyanuric acid in Santa Ana River stormflow during the third storm was calculated to be about 1 percent of the yearly application rate for triazine herbicides. Cyanuric acid was not detected in ground water at wells adjacent to the Santa Ana River.
Posted January 2008
Leenheer, J.A., Izbicki, J.A., Rostad, C.E., Noyes, T.I., and Woodside, Greg, 2008, Discovery of cyanuric acid during an assessment of natural organic matter in stormflow water of the Santa Ana River, southern California, 2003–2004: U.S. Geological Survey Scientific Investigations Report 2007–5048, 13 p.
Methods and Approach
Preparative Dissolved Organic Matter Fractionation and Isolation Procedure
Fourier Transform-Infrared Spectrometry
Solid-State Cross-Polarization Magic Angle Spinning 13C-Nuclear Magnetic Resonance Spectrometry
Electrospray Ionization/Mass Spectrometry
Cyanuric Acid in Stormflow Water
Dissolved Organic Matter Fractionations
Spectral Characterizations of Cyanuric Acid in Hydrophilic Acid plus Neutral Fractions
Possible Sources of Cyanuric Acid
|Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Acrobat Reader or similar software is required to view it. Download the latest version of Acrobat Reader, free of charge or go to access.adobe.com for free tools that allow visually impaired users to read PDF files.|