Selective spectrophotometric determination of uranium |
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Authors: | B.W. Budesinsky |
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Affiliation: | Phelps Dodge Corporation, Morenci, Arizona 85540 U.S.A. |
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Abstract: | Uranium(VI) (10–100 μg) is extracted with 2% dibenzoylmethane in benzene at pH 6–7 while other cations are masked with CDTA (maximum of 8 μg/100 ml). Shaking with 6 M hydrochloric acid reintroduces uranium(VI) into the aqueous phase, where after evaporation and complexation with Arsenazo III in 0.02 M hydrochloric acid the final measurement of absorbance at 650 nm is performed. Iron(III), copper(II), aluminum, and zinc do not interfere even if present in amounts of 15–19 mmol. |
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