1. Yemen Standardization, Metrology and Quality Control Organization (YSMQ), Sana’a, Yemen
2. Institute of Ocean and Earth Sciences (IOES), University of Malaya, Kuala Lumpur, Malaysia
3. Environmental Research Group, Department of Chemical Sciences, Faculty of Science and Technology, Universiti Malaysia Terengganu, Terengganu, Malaysia
4. Department of Chemistry, College of Science, University of Ha'il, Hail, Saudi Arabia
5. Basic Science Department, Preparatory Year, University of Ha’il, Hail, Saudi Arabia
6. Micro-Pollutant Research Centre (MPRC), Department of Water and Environmental Engineering, Faculty of Civil & Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Batu Pahat, Johor, Malaysia