1. Department of Environmental Analysis and Engineering, Babes-Bolyai University, 30 Fantanele St., 400294 Cluj-Napoca, Romania
2. Madia Department of Chemistry, Biochemistry, Physics and Engineering, Indiana University of Pennsylvania, 421 North Walk, Indiana, PA 15705, USA
3. National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donat St., 400293 Cluj-Napoca, Romania