[1] Norwegian Inst Water Res, Oslo, Norway
[2] Lancaster Environm Ctr, Ctr Ecol & Hydrol, Lancaster, England
[3] ETH, Zurich, Switzerland
[4] CSIC, IDAEA, Inst Environm Assessment & Water Res, Barcelona, Spain
[5] Univ Insubria, Como, Italy
[6] Aarhus Univ, Roskilde, Denmark
[7] Univ Lancaster, Lancaster, England
[8] Lund Univ, S-22100 Lund, Sweden
[9] Univ Kassel, Witzenhausen, Germany
[10] Michigan Technol Univ, Houghton, MI 49931 USA
[11] Univ Gottingen, D-3400 Gottingen, Germany
[12] UFZ Helmholtz Ctr Environm Res, Leipzig, Germany
[13] Chinese Acad Sci, Guangzhou Inst Geochem, Beijing 100864, Peoples R China