1. Department
of Chemistry, The University of Texas at El Paso, 500 W. University
Avenue, El Paso Texas 79968, United States
2. Environmental
Science and Engineering PhD Program, The University of Texas at El Paso, 500 W. University Avenue, El Paso Texas 79968, United States
3. University
of California Center for Environmental Implications of Nanotechnology
(UC CEIN), The University of Texas at El Paso, El Paso Texas 79968, United States
4. Department
of Analytical Chemistry, The Connecticut Agricultural Experiment Station, 123 Huntington Street, New Haven, Connecticut 06504, United States