The behaviour of the rare earth elements during mixing of river and sea waters

Details The behaviour of the rare earth elements during mixing of river and sea waters The behaviour of the rare earth elements during mixing of river and sea waters

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48..143h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 48, Issue 1, pp.143-149

Physics

10

Scientific paper

Rare earth element concentrations have been measured in organic-rich Luce river water and coastal sea water. Concentrations ( e.g. ~350-1850 pmol/kg Nd in the Water of Luce and ~45-350 pmol/ kg Nd in Luce Bay) are related to the presence of particles, with 30-60% of the REE associated with >0.4-0.7 m particles, and to riverine Fe concentrations. REE fractionation occurs in the river water the submicrometre river water is heavy REE enriched whereas the coarser fraction has a more shale-like REE pattern. Laboratory experiments show that the REE in organic-rich river waters are chiefly associated with Feorganic matter colloids which flocculate during estuarine mixing. Preferential removal of heavy REE (~95%) relative to light REE (~60%) occurs, but no Ce anomaly is developed. In contrast, no REE removal occurs during estuarine mixing with organic-poor river water.

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