1. Department of Civil Engineering; Tokyo Institute of Technology; Tokyo 152-8550 Japan
2. Department of Geology; University of Malaya; Kuala Lumpur 50603 Malaysia
3. Department of Chemistry; University of Malaya; Kuala Lumpur 50603 Malaysia
4. Department of Chemistry; FI- 40014 University of Jyväskylä; Finland
5. Chemical Resources Laboratory, Bio-Resources Division; Tokyo Institute of Technology; Yokohama 226-8503 Tokyo Japan
6. Department of Hydrology and Water Resources Management; King Abdulaziz University; Jeddah 21589 Saudi Arabia
7. Institute of Chemical Sciences; Bahauddin Zakariya University; Multan 60800 Pakistan