1. Center for Environmental Measurement and Modeling, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, North Carolina 27711, United States
2. Center for Environmental Solutions and Emergency Response, Office of Research and Development, U.S. Environmental Protection Agency, Ada, Oklahoma 74820, United States
3. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
4. Jacobs Technology, Inc., 109 T.W. Alexander Drive, RTP, North Carolina 27711, United States
5. BioGeoChem Scientific, Austin, Texas 78748, United States