1. Department
of Water Chemistry, Federal Institute of Hydrology (BfG), Am Mainzer
Tor 1, D-56068 Koblenz, Germany
2. Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
3. Department
of Civil Engineering, University of Akron, Akron, Ohio 44325, United States
4. Department
of Crop Sciences and The Safe Global Water Institute, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States