1. Department of Physical Sciences, College of Southern Nevada, Las Vegas, Nevada, USA
2. Department of Environmental Geochemistry, Fluminense Federal University, Niterói, Brazil
3. Department of Soil and Water Resources Management, Wollo University, Dessie, Ethiopia
4. Civil, Mining and Process Engineering, Namibia University of Science and Technology, Windhoek, Namibia
5. University Mohamed El Bachir El Ibrahimi Bordj Bou Arreridj, Algeria