1. Department of Geography; University of Zurich; Zurich; Switzerland
2. Soil and Land Systems, School of Earth, Environmental Sciences; University of Adelaide, Waite Campus; Urrbrae, South Australia; Australia
3. Department of Geography and Environmental Engineering; Johns Hopkins University; Baltimore; Maryland; USA
4. Department of Earth and Environmental Sciences, Lamont-Doherty Earth Observatory; Columbia University; Palisades; New York; USA
5. Department of Applied Environmental Science (ITM); Stockholm University; Stockholm; Sweden
6. CSIRO Land and Water; Glen Osmond, South Australia; Australia
7. Department of Earth Science; Rice University; Houston; Texas; USA
8. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry; Chinese Academy of Sciences; Guangzhou; China
9. Department of Geological Sciences and Environmental Studies; State University of New York at Binghamton; Binghamton; New York; USA
10. Environmental Molecular Science Institute; Ohio State University; Columbus; Ohio; USA
11. Department of Chemistry and Biochemistry; University of Denver; Denver; Colorado; USA
12. Geologischer Dienst NRW; Krefeld; Germany
13. Department of Oceanography; University of Hawaii at Manoa; Honolulu; Hawaii; USA
14. Institute of Crop Science and Resource Conservation, Division of Soil Science; University of Bonn; Bonn; Germany
15. Air Quality Research Division, Atmospheric Science and Technology Directorate, Science and Technology Branch; Environment Canada; Toronto, Ontario; Canada
16. R.M. Parsons Laboratory, Department of Civil and Environmental Engineering; Massachusetts Institute of Technology; Cambridge; Massachusetts; USA
17. Laboratoire de Chimie Bioorganique et Organique Physique, UMR CNRS 7618 BIOEMCO; Ecole Nationale Supérieure de Chimie de Paris; Paris; France
18. Laboratoire Biogéochimie et Écologie des Milieux Continentaux; Site du Centre INRA Versailles-Grignon; Thivernal-Grignon; France
19. Institute for Soil Science and Plant Nutrition; Martin Luther University; Halle-Wittenberg; Germany
20. Department Biogeoquímica y Dinámica de Contaminantes; Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS-CSIC); Sevilla; Spain
21. School of Civil Engineering and Geosciences; University of Newcastle upon Tyne; Newcastle; U.K.
22. Analysis and Air Quality Division; Environmental Technology Center; Ottawa, Ontario; Canada