1. Faculty of Graduate Studies, Sabaragamuwa University of Sri Lanka, Belihuloya 70140, Sri Lanka
2. Department of Physical Sciences and Technology, Faculty of Applied Sciences, Sabaragamuwa University of Sri Lanka, Belihuloya 70140, Sri Lanka
3. Department of Geology, Faculty of Science, University of Peradeniya, Peradeniya 20400, Sri Lanka
4. Department of Chemistry, Faculty of Science, University of Peradeniya, Peradeniya 20400, Sri Lanka