I very much appreciated many editorial suggestions that resulted in valuable revisions to the manuscript of this issue of Geochemical Perspectives. Extensive editing was contributed by Liane G. Benning, University of Leeds and now at the Geoforshungs Zentrum in Postsdam, and Dave Wesolowski, U.S. Oak Ridge National Laboratory. Sections were reviewed by Martin Schoonen, U.S. Brookhaven National Laboratory; Terry Seward, Victoria University, Wellington, New Zealand; Antonio Lasaga; Roger McLimans, DuPont Corporation; Jim Murowchick, University of Missouri-Kansas City and Mary Barnes, Penn State University.

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