1. Department of Isotope Biogeochemistry, Helmholtz Centre for Environmental Research-UFZ,Permoserstraße 15, 04318 Leipzig, Germany
2. Ecometrix Incorporated, 6800 Campobello Road, Mississauga, ON L5N 2L8, Canada
3. Isodetect GmbH, Deutscher Platz 5b, 04103 Leipzig, Germany