Chemical condition for the appearance of a negative Ce anomaly in stream waters and groundwaters

Nine publications showing REE data in groundwaters and river water were examined to understand the general condition of terrestrial water where a negative Ce anomaly develops. It was found that the negative Ce anomaly only appeared when Fe, Mn and dissolved organic carbon (DOC) concentrations were l...

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Bibliographic Details
Published inGEOCHEMICAL JOURNAL Vol. 42; no. 4; pp. 371 - 380
Main Authors SETO, MAYUMI, AKAGI, TASUKU
Format Journal Article
LanguageEnglish
Published GEOCHEMICAL SOCIETY OF JAPAN 01.01.2008
Subjects
Ce anomaly
dissolved organic carbon
iron
manganese
Rare Earth Element
Redox processes
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Summary:Nine publications showing REE data in groundwaters and river water were examined to understand the general condition of terrestrial water where a negative Ce anomaly develops. It was found that the negative Ce anomaly only appeared when Fe, Mn and dissolved organic carbon (DOC) concentrations were low (Fe and Mn < 5 × 10-5 mol/L and DOC < 10 mg/L). Assuming that Ce3+ and Fe2+ concentrations were limited by the formation of cerianite and ferrihydrite, respective redox potential (Eh) was calculated from each of Ce3+ and Fe2+ concentrations. For data sets displaying Ce anomalies, the calculated Ehs (cEhs) showed a 1:1 relationship between Ce and Fe. This relationship indicates that the absolute concentration of Ce in natural water may be thermodynamically determined in situ by Eh and pH when concentrations of Fe, Mn and DOC are poor.
ISSN:0016-7002
1880-5973
DOI:10.2343/geochemj.42.371