SOLUBILITY OF ND IN BRINE

The solubility of Nd(III) has been measured at 23+/-3 degrees C in a s ynthetic brine at pcH 6.4, 8.4, 10.4 and 12.4. The brine consisted pre dominantly of (Na+K)Cl and MgCl2 with an ionic strength of 7.8 M (9.4 m) a solid compound of Nd(III) at each pcH was assigned from X-ray dif fraction patterns. The log values of the experimental solubilities dec rease from -3 at pcH 6.4 to -5.8 at pcH 8.4; at pcH 10.4 and 12.4 the solubility was below the detection limit of -7.5. The experimental sol ubility does not follow closely the variation with pcH estimated from modeling of the species in solution in equilibrium with the Nd solid u sing S.I.T.