1. Assistant Professor of Environmental Engineering, Dept. of Civil and Environmental Engineering, Univ. of Cincinnati, P.O. Box 210071, Cincinnati, OH 45221-0071 (corresponding author). E-mail: margaret.kupferle@uc.edu
2. Professor, Dept. of Chemistry, College of Science, Univ. of Cairo, Postal Code 12613, Giza, Egypt.
3. Associate Dean for Graduate Studies and Research, Herman Schneider Professor of Environmental Engineering, Dept of Civil and Environmental Engineering, Univ. of Cincinnati, P.O. Box 210071, Cincinnati, OH 45221-0071. E-mail: paul.bishop@uc.edu