1. Laboratory for Air Pollution/Environmental Technology, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
2. Department of Process Engineering, Eawag, Swiss Federal Institute for Aquatic Science and Technology, 8600 Dübendorf, Switzerland
3. Department of Environmental Sciences, University of Basel, 4056 Basel, Switzerland
4. Laboratory for Transport at Nanoscale Interfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
5. Centre for Stable Isotope Research and Analysis, University of Göttingen, 37077 Göttingen, Germany