1. Geochemistry Lab, Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226007, India
2. Department of Chemistry, Faculty of Science, University of Lucknow, Lucknow 226007, India
3. Analytical Chemistry, Regulatory Toxicology Group, CSIR-Indian Institute of Toxicology Research, Lucknow 226001, India