A new method of uranium preseparation and concentration for neutron activation analysis

Abstract

This paper introduces a new type of extractant, sym-dibenzo-16-crown-5-oxyhydroxamic acid (HL). The extraction of UO22+, Na+, K+, Sr2+, Ba2+ and Br− were studied with HL in chloroform. The results obtained show that UO22+ can be quantitatively extracted at pH above 5, whereas the extractions of K+, Na+, Ba2+ and Br− are negligible in the pH range of 2–7. The dependence of the distribution ratio of U(VI) on both the concentration of the HL and pH are linear, and they have the same slope of 2. This suggests that U(VI) appears to form a 1∶2 complex with ligand.