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The above paper has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Editors-in-Chief. Despite the inclusion of interesting original data in this paper, serious concerns have been raised about the manner of their interpretation in the Discussion section. Parts of papers Appl Geochem, 19 (2004), 1255–1293http://dx.doi.org/10.1016/j.apgeochem.2004.02.001 and Water Res. Research, 37(2001), 109–117http://dx.doi.org/10.1029/2000WR900270 have been plagiarized. An initial attempt to address this issue with the authors resulted in a Corrigendum but the explanations offered in this were not subjected to sufficient scrutiny, due to a combination of errors by the Publisher and the Editors-in-Chief, and were later judged to be incomplete. [ABSTRACT FROM AUTHOR]