1. Aluminum Sulphate Company of Egypt, Egypt
2. Egyptian Petroleum Research Institute (EPRI), Nasr City, Cairo, Egypt
3. Chemistry Departments, Faculty of Science, Helwan University, Cairo, Egypt
4. Department of Chemistry, Faculty of Science, King Khalid University, Abha 9004, Saudi Arabia
5. Nuclear Materials Authority, P.O. Box 530, El Maddi, Cairo, Egypt
6. Department of Basic Science, The Valley Higher Institute for Engineering & Technology, Al-Obour 11828, Egypt