1. a Department of Polymer Science and Engineering, College of Engineering , Pusan National University , Pusan , 609-735 , South Korea
2. b Department of Chemistry, Physical Chemistry Research Laboratory , University of Rajshahi , Rajshahi , 6205 , Bangladesh
3. c Environmental Science Division, National Exposure Research Laboratory , US Environmental Protection Agency , P.O. Box 93478, Las Vegas , NV , 89193-3478 , USA