Spectrophotometric Extraction Methods Specific for Uranium

TLDR: Two spectrophotometric extraction methods specific for uranium were described in this paper, and the limit of sensitivity is 0.8 gamma for the dibenzoylmethane method.

Abstract: Two spectrophotometric extraction methods specific for uranium are described. Uranium as tetrapropylammonium uranyl trintrate is quantitatively separated from large quantities of diverse ions by extraction into methyl isobutyl ketone (4-methyl-2-penthnone) from an acid-deficient aluminum nitrate salting solution. Milligram levels are determined by a direct absorbance measurement of the trinitrate complex in the separated organic phase at 452 m alpha Microgram amounts are determined by adding dibenzoylmethane (1,3-dipbenyl- 1,3propanedione) in an ethyl alcohol -pyridine mixture to the separated organic phase and measuring the absorbance of the chelate at 415 m mu . The coefficient ofvariation is less than 1% at the 10-mg. and 25- gamma levels. The limit of sensitivity is 0.8 gamma for the dibenzoylmethane method. (auth)