A rapid radiochemical procedure for uranium determination in natural waters

A neutron activation analysis method for the determination of uranium in natural fresh waters is described. The method is based on a preconcentration step by precipitation of the metal oxinate on a phenolphtalein bed followed by instrumental neutron activation analysis. Preliminary investigations with 2 3 9 U radiotracer were carried out to set up the best working conditions and to evaluate the chemical yield. The whole procedure has been applied to the determination of uranium in river water.