Extractive—spectrophotometric determination of americium at trace levels with arsenazo-III |
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Authors: | J.P. Shukla M.S. Subramanian |
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Affiliation: | Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Bombay-4OOO85 India |
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Abstract: | Americium(III) can be quantitatively extracted with 1 M diisoamylsulphoxide in Solvesso-100 from aqueous 0.02 M HNO3—2.5 Al(NO3)3 solutions and, after dilution of the extract with ethanol and nitric acid, determined in the organic phase with arsenazo-III. The apparent molar absorptivity is 1.58 × 105 l mol-1 cm-1 at 652 nm. The system obeys Beer's law within the range 0.1–1.6 μg Am ml-1; 0.11 μg Am ml-1 is determined with a reproducibility better than ±2%. Relatively large amounts of Ca(II), Cr(III), Fe (III), U(VI), Cl-, NO2-, NO3- and F- are tolerated. Interferences of Ce(IV), Pu(IV) and Th(IV) are eliminated by prior extraction with 2-thenoyltrifluoroacetone; only europium(III) interferes appreciably. Colour development is almost instantaneous and absorbances are virtually constant for 12 h. |
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