Coulometric Determination of Uranium(IV) by Oxidation at Controlled Potentials

Boyd, C.M.; Menis, Oscar

doi:10.1021/ac60176a046

Cited by 16 publications

(2 citation statements)

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“…The U(IV)-U(VI) couple is not reversible ; therefore the potential at which anodic oxidation takes place must be determined experimentally. A previous study of the polarographic determination of U(IV) by means of the anodic wave (11) made it possible to select the (Zr hydrolyzed) 1 For conditions see Procedure.…”

Section: Resultsmentioning

confidence: 99%

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Controlled-Potential Coulometric Titration of Uranium(IV) and Uranium(VI) in Sodium Tripolyphosphate Medium.

Zittel¹,

Dunlap²

1963

Anal. Chem.

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A partially successful attempt was made in this investigation to eliminate molybdenum interference with the use of reagents that would strongly complex the molybdenum and move to its half-wave potential to more negative values, but have no effect on the Nb-EDTA complex. Reagents used were glycol dimercaptoacetate, 1,5-diphenyl-3-thiocarbohydrazide, quinoxaline-2,3dithiol, and mercaptoacetic acid. Of these, the glycol dimercaptoacetate was the most promising.The tantalum-EDTA complex was prepared (6) and found to have a halfwave potential more negative than the niobium-EDTA complex by about 0.5 volt. Nevertheless, tantalum interfered with the determination of niobium. The ratio of tantalum to niobium that may be tolerated in the polarographic determination of niobium was studied.The results are tabulated in Table IV.Each sample contained 20.00 yg. of Nb per ml. These solutions were 0.1M in EDTA and O.lili in sodium acetate, and had a pH of 4.06 ± 0.03.These results indicate that tantalum may be tolerated up to a ratio of 2:1, Ta:Nb with a deviation of 2.0% or less.

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Section: Resultsmentioning

confidence: 99%

“…The IT(VI) can be titrated either coulometrically (9) or with some suitable chemical titrant (4). Recently, Boyd and Menis (1) published a method for the direct determination of U(IV) by controlled-potential oxidation at a platinum electrode. All the above-mentioned methods are carried out in acid media.…”

Section: Ueanium(iv)mentioning

confidence: 99%