1. Centre for Ionics University of Malaya, Faculty of Science; University of Malaya; Lembah Pantai 50603 Kuala Lumpur Malaysia
2. Department of Chemistry, Sciences and Arts College - Rabigh; King Abdulaziz University; Rabigh Saudi Arabia
3. Department of Chemistry, Faculty of Science; University of Malaya; Lembah Pantai 50603 Kuala Lumpur Malaysia