1. Department of Environmental Sciences, Jahangirnagar University, Savar, Bangladesh
2. Instructor Class “B”, Army Medical Corps Centre and School, Ghatail, Bangladesh
3. Materials Science Division, Atomic Energy Centre, Dhaka, Bangladesh
4. Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan
5. Institute of National Analytical Research and Service (INARS), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhanmondi, Bangladesh