Hydrogen cerium phosphate

Araki et al. [21] have described an ion exchange chromatographic technique for determining these elements. Detection was by hydrogen flame ionisation. Cerium and phosphate interfere in this method. 

The uranium(iv)-cerium(iv) reaction has been investigated in tributyl phosphate-chloroform solutions. The reaction is second-order overall and in 20—30% BU3PO4 the rate constant is about two orders of magnitude lower than for the corresponding aqueous reaction at the same temperature. As in the aqueous system, the rate is inversely dependent on hydrogen-ion concentration. The activation energy is also similar to that in water and is independent of tributyl phosphate concentration and pH. 

---