1. Lecturer, Dept. of Chemistry, King Fahd Univ. of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
2. Associate Professor, Dept. of Chemistry, King Fahd Univ. of Petroleum and Minerals, Dhahran 31261, Saudi Arabia (corresponding author).
3. Lecturer, Dept. of Natural Sciences, School of Pure and Applied Sciences, Garissa Univ., P.O. Box 1801-70100, Garissa, Kenya.
4. Professor, Dept. of Chemistry, King Fahd Univ. of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
5. Associate Professor, Dept. of Earth Sciences, King Fahd Univ. of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.