1 Department of Analytical Chemistry, The Center for Sustainable Nanotechnology, Connecticut Agricultural Experiment Station, New Haven, CT, USA. Jason.White@ct.gov.
2 Department of Chemistry and Biochemistry, Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, UC Center for Environmental Implications of Nanotechnology, University of Texas at El Paso, El Paso, TX, USA. jgardea@utep.edu.