1. Institute
for Environmental Sciences, University of Koblenz-Landau, Fortstrasse
7, 76829 Landau/Palatinate, Germany
2. Institute
for Particle Technology, Technical University Braunschweig, Volkmaroder
Strasse 5, 38106 Braunschweig, Germany
3. Department
of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Lennart Hjelms väg 9, 75007 Uppsala, Sweden