1. a Department of Civil and Environmental Engineering, 420 Snell Engineering Center, Northeastern University, Boston, MA 02115
2. b Chemistry Department, Louisiana State University, Baton Rouge, LA 70803
3. c Electrokinetics, Inc., 11552 Cedar Park Avenue, Baton Rouge, LA 70809
4. d U.S. Army Engineer Research and Development Center, Waterways Experiment Station, 3909 Halls Ferry Road, Vicksburg, MS 39180