Effect of temperature on the partition of rubidium between sylvite crystals and aqueous solutions
Effect of temperature on the partition of rubidium between sylvite crystals and aqueous solutions (in Saline deposits--Internat. Conf. Saline Deposits, Houston, Tex., 1962, Symposium)
Special Paper - Geological Society of America (1968) 88: 505-524
- alkali metals
- chlorides
- experimental studies
- geochemistry
- halides
- metals
- mineral data
- phase equilibria
- rubidium
- sea water
- sylvite
- partition
- temperature effects
- Experimerimental studies
- Rubidium partition
- Rb partition
- Rb content
- temperature effect on partition coefficient
- effect of temperature and Bi
- Sylvite-aqueous solution
Sea water contains about 0.12 ppm Rb, most of which is in K minerals in evaporites. The amount of Rb in a mineral depends upon the partition coefficient, D=(Rb/K) (sub s) /(Rb/K) (sub L) , the Rb/K ratio in sylvite to that of sea water. Results of six different temperatures from 0 degrees to 100 degrees C show that D is related to temperature by the equation, D=0.277-0.8168(10 (super 3) /T degrees K)+ or -0.001. The effects of occluded mother liquor on D was also investigated. Normally, KCl is cubic and tends to be cloudy due to liquid occlusions. If a small amount of Bi is added, crystals develop octahedra and are clear. A comparison of D with and without Bi at 40 degrees C showed no essential difference. It is concluded that the amount of liquid occlusion in sylvite is insufficient to affect the value of D significantly.
