1. a Department of Chemistry, Graphic Era Hill University, Dehradun, Uttarakhand, India, 248002
2. b Department of Civil Engineering, Uttarakhand Technical University, Dehradun, Uttarakhand, India
3. c Department of Geography, Faculty of Natural Sciences, Jamia Millia Islamia, New Delhi, India
4. d Roorkee College of Engineering, Roorkee, Uttarakhand, India