title: Gadolinium: Distribution between Aqueous and Silicate Phases.
abstract: Studies of the partition of trivalent gadolinium between aqueous and silicate phases have been made at temperatures from 800 degrees to 900 degrees C and at pressures from 500 to 1000 bars. Constant values for the distribution coefficients for forsterite, enstatite, and diopside were obtained over a concentration range from 0.6 part per billion to 4 parts per thousand in the solid phases. Ratios of silicate crystal-aqueous phase distribution coefficients to silicate melt-aqueous phase distribution coefficients are close to the values for silicate crystal-silicate melt distribution coefficients estimated from natural systems. The free ion activity of trivalent gadolinium in the silicate melts appears to be less than one-hundredth of its value for aqueous phases of the same concentration.
authors.forename: R L
authors.initials: RL
authors.lastname: Cullers
authors.forename: L G
authors.initials: LG
authors.lastname: Medaris
authors.forename: L A
authors.initials: LA
authors.lastname: Haskin