1. 1Department of Chemistry, Koneru Lakshmaih Education Foundation, Green fields, Vaddeswaram, 522502, Andhra Pradesh, India.
2. 3Department of Engineering Chemistry, JNTU College of Engineering, Anantapur constituent unit of J.N.T. University Anantapur, Ananthapuramu 515 002, Andhra Pradesh, India.
3. 2Rayalaseema Thermal power project, Kadapa 516380, Andhra Pradesh, India.