1. Water Pollution Research Department, National Research Centre, 33 El Bohouth St, Dokki, Giza, Egypt, PO 12622, Egypt
2. Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
3. Department of Civil Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4