1. Dept. of Civil Engineering, National Inst. of Technology, Tiruchirappalli, Tamil Nadu 620015, India
2. Dept. of Civil Engineering, CARE School of Engineering, Tiruchirappalli, Tamil Nadu 620009, India
3. Dept. of Chemistry, Jamal Mohamed College, Tiruchirappalli, Tamil Nadu 620020, India
4. Environmental Research Centre, J. J. College of Engineering and Technology, Tiruchirappalli, Tamil Nadu 620009, India