1. Center for Environmental Nanoscience and Risk, Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, Columbia, South Carolina, USA
2. Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
3. National Center for Earth and Environmental Nanotechnology Infrastructure (NanoEarth), Institute for Critical Technology and Applied Science, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA
4. Department of Civil Engineering, California State University Chico, 400 W 1st St, Chico, CA 95929, USA
5. Department of Earth and Environmental Sciences, California State University Chico, 400 W 1st St, Chico, CA 95929, USA
6. U.S. Geological Survey, California Water Science Center, 6000 J Street, Sacramento, CA 95819, USA