1. Institute for Analytical Chemistry, Vienna University of Technology, Getreidemarkt 9/151, A-1060 Vienna, Austria, Institute for Water Provision, Water Ecology, and Waste Management, University of Agricultural Sciences, Muthgasse 18, A-1190 Vienna, Austria, Institute of Experimental Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria, and Institute of Applied Microbiology, University of Agricultural Sciences, Muthgasse 18, A-1190 Vienna, Austria