1. Chemistry Department, Colby College, 5755 Mayflower Hill, Waterville, Maine 04901-8857, Urban Water Research Center and Department of Civil and Environmental Engineering, University of California, Irvine, Irvine, California 92697-2175, Chemistry Department, University of Otago, P.O. Box 56, Dunedin, New Zealand, Department of Chemistry, University of Western Michigan, 3425 Wood Hall, Kalamazoo, Michigan 49008, and Department of Chemistry, U.S. Naval Academy, 572 Holloway Road, Annapolis, Maryland 21402