1. Environmental Chemistry Laboratory, Resource Management and Environment Section, Life Science Division, Institute of Advanced Study in Science and Technology, Guwahati 781035, Assam, India
2. Homi Bhabha Centre for Science Education, Tata Institute of Fundamental Research, Mumbai 400088, Maharashtra, India
3. Department of Environmental Science, Gauhati University, Guwahati 781014, Assam, India