1. Doctoral Researcher, Louisiana State Univ., Baton Rouge, LA 70803.
2. Associate Professor, Environmental Engineering Sciences, Univ. of Florida, Black Hall, Gainesville, FL 32611–6450; formerly, Associate Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ. (corresponding author).
3. Professor, Chemistry Dept., Louisiana State Univ., Baton Rouge, LA 70803.