Affiliation: | 1 Texas Tech University, Department of Geosciences, P.O. Box 41053, Lubbock, TX 79409-1053, USA 2 Illinois State Water Survey, 2204 Griffith Drive, Champaign, IL 61820-7495, USA 3 Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, MS 6110, Oak Ridge, TN 37831-6110, USA |