1. Assistant Professor, Dept. of Environmental Science, Tezpur Univ., Napaam, Assam 784028, India (corresponding author).
2. Research Scholar, Dept. of Environmental Science, Tezpur Univ., Napaam, Assam 784028, India.
3. Research Scholar, Dept. of Chemistry, Visva Bharti Univ., Bolpur, West Bengal 731236, India.
4. Postdoc, Dept. of Environmental Science, Tezpur Univ., Napaam, Assam 784028, India.
5. Research Scholar, Centre for the Environment, Indian Institute of Technology, Guwahati, Assam 781039, India.
6. Nanyang Environment and Water Research Institute, Nanyang Technological Univ., Singapore 637141.