1. Faculty of Chemistry, Materials Research Centre, Brno University of Technology, Purkyňova 118, 612 00 Brno, Czech Republic
2. Department of Geosciences, Texas Tech University, Lubbock, Texas 79409-1053, United States
3. Illinois State Water Survey, University of Illinois, 1506 Coral Cove Drive, Champaign, Illinois 61821, United States