JavaScript requeired.
Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Rare earth element partitioning between Fe oxyhydroxide precipitates and aqueous NaCl solutions doped with NaHCO3: Determinations of rare earth element complexation constants with carbonate ions

Atsuyuki Ohta, Iwao Kawabe
Geochemical Journal, Vol. 34, No. , P. 439-454, 2000

ABSTRACT

The distribution coefficients of rare earth elements (REEs; all lanthanides except Pm, Y and Sc) between Fe oxyhydroxide precipitates and 0.5 M NaCl solutions with NaHCO3 (0.0∼12.0 mM) at 25°C and 1 bar have been determined. This experimental system is a simple model for REE partitioning between deep-sea ferromanganese nodules and seawater. The distribution coefficients, Kd(REE: precipitate/solution), show systematic variations with increasing NaHCO3 concentrations. We have determined REE(III)-carbonate complexation constants from the experimental distribution coefficients as a function of NaHCO3 concentration and pH. The REE(III)-carbonate complexation constants show almost the same series variations as reported values obtained by the solvent-extraction method, although our results by the precipitation method are rather higher by 1.0∼1.5 in log unit than the literature data at zero ionic strength.

All Issues

Current Issue:
Stats:
Impact Factor: 1.561
Geochemical Society of Japan

page top