1. Colorado State University-Pueblo, Chemistry Department, 2200 Bonforte Blvd, Pueblo, CO 81001
2. U.S. Geological Survey, National Water Quality Laboratory, Methods Research and Development Program, P.O. Box 255857, Building 95, Denver Federal Center, Denver, CO 80225-0585
3. U.S. Geological Survey, 400 S. Clinton St., Suite 269, Iowa City, IA 52240-4105
4. U.S. Environmental Protection Agency, Region 8 Laboratory, 16194 W. 45th Drive, Golden, CO 80403-1790
5. Eastern Washington University, Department of Chemistry and Biochemistry, 226 Science Building, Cheney, WA 99004