1. GEH Wasserchemie GmbH & Co. KG, Adolf-Köhne-Straße 4, Osnabrück 49090, Germany
2. Institute of Environmental Technology and Water Quality Engineering, TU Berlin, Strasse des 17. Juni 135, Berlin 10623, Germany
3. Geosciences Institute, Johannes Gutenberg University, Becherweg 21, Mainz 55099, Germany