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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 Ce 3+ and Fe 2+ concentrations were limited by the formation of cerianite and ferrihydrite, respective redox potential (Eh) wasdoi:10.2343/geochemj.42.371 fatcat:lsrhmjd4ynbebplwtf2p2zcufq