1. Institute of Environmental Engineering, University of Pannonia, P.O. Box 158, Veszprem 8201, Hungary
2. Department of Chemistry and Biochemistry, Montana State University, P.O. Box 173400, Bozeman, Montana 59717, United States
3. Department of General and Inorganic Chemistry, University of Pannonia, P.O .Box 158, Veszprem 8201, Hungary
4. Department of Analytical Chemistry, University of Pannonia, P.O. Box 158, Veszprem 8201, Hungary