1. Center
for Environmental Implications of NanoTechnology (CEINT), Duke University, P.O.
Box 90287, Durham, North Carolina 27708-0287, United States of America
2. Surface and Aqueous Geochemistry Group, Department of Geological & Environmental Sciences, Stanford University, Stanford, California 94305-2115, United States of America
3. Aix-Marseille Université, CNRS, IRD, CEREGE
UM34, 13545 Aix en Provence, France
4. Department
of Civil and Environmental Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania, 15213, United States of America
5. Nicholas
School of the Environment, Duke University, Durham, North Carolina, 27708, United States of America
6. Department
of Engineering and Public Policy, Carnegie Mellon University, Pittsburgh, Pennsylvania, 15213, United States of America
7. Sinnhuber
Aquatic Research Laboratory, Oregon State University, 28645 East
HWY 34, Corvallis, Oregon 97333, United States of America
8. Stanford
Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States of America
9. Department
of Photon Science, SLAC National Accelerator Laboratory, 2575 Sand
Hill Road, Menlo Park, California 94025, United States of America
10. Department
of Civil and Environmental Engineering, Duke University, Durham, North Carolina 27708-0287, United States of America