1. Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam-Golm, Germany
2. Fraunhofer Institute for Applied Polymer Research, D-14476 Potsdam-Golm, Germany
3. Institute of Geoecology, University of Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam-Golm, Germany