1. Department of Soil Protection and Ecotoxicology, Institute of Environmental Protection and Agriculture (IUL), Schwarzenburgstrasse 155, CH-3005 Berne, Switzerland
2. Department of Chemistry and Biochemistry, NMR Spectroscopy Group, Freiestrasse 3, CH-3012 Berne, Switzerland
3. Interlabor Belp AG, Birkenweg 6, CH-3123 Belp, Switzerland