Physics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.2133j&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 49, Issue 10, pp.2133-2139
Physics
6
Scientific paper
Solubility product determinations suggest that the hydrous phosphates of the rare earths, REPO 4 · xH 2 O , are important in controlling the sea water REE concentrations. Two of these solids, rhabdophane, (P6 2 22) and "hydrous xenotime", (14 1 /amd), have been synthesized at 100°C via the acid hydrolysis of the respective REE pyrophosphate. The solubility products at infinite dilution were determined to be pK 0 = 24.5, (La at 25°C); 26.0, (Pr at 100°C); 25.7, (Nd at 100°C): and 25.5, (Er at 100°C). On the basis of calculations involving the reaction of RE 3+ with apatite to form the hydrous phosphate, the lanthanum concentration in sea water is predicted to be about 140 pmol/L. Laboratory experiments support the hypothesis that apatite is a substrate for reactions with dissolved REE.
Bancroft Michael G.
Jonasson Ralph G.
Nesbitt Wayne H.
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