Determination of uranium and plutonium in VVER spent fuel solutions using differential spectrophotometry

Nikitina, S.A.; Lipovskiĭ, A. A.; Dem'yanova, T.A.; Ryzhinskii, M.V.; Preobrazhenskaya, L.D.

doi:10.1007/bf02517661

Cited by 3 publications

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“…The chosen reagent containing one carboxy and one arsonic acid group in a molecule (see below) was used previously as indicator in determination of the sulfate ion [6], Th [7], and Np [8], and in the differential version of the procedure for determination of Pu in analysis of spent nuclear fuel [9,10] Nikitina et al [9] showed that, in a nitric acid medium (0.13 0.2 M HNO 3 ), Pu(IV) forms two complexes with carboxyarsenazo (A): a 1 : 1 (PuA) complex at C A : C Pu < 10 : 1 and a 1 : 2 (PuA 2 ) complex at a 20-fold excess of carboxyarsenazo. The chosen reagent containing one carboxy and one arsonic acid group in a molecule (see below) was used previously as indicator in determination of the sulfate ion [6], Th [7], and Np [8], and in the differential version of the procedure for determination of Pu in analysis of spent nuclear fuel [9,10] Nikitina et al [9] showed that, in a nitric acid medium (0.13 0.2 M HNO 3 ), Pu(IV) forms two complexes with carboxyarsenazo (A): a 1 : 1 (PuA) complex at C A : C Pu < 10 : 1 and a 1 : 2 (PuA 2 ) complex at a 20-fold excess of carboxyarsenazo.…”

Section: Version B Analysis Of Pu In the Presence Of U With Carboxyamentioning

confidence: 99%

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10.1007/s11137-008-1013-4

2000

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Two versions of a spectrophotometric method with internal referencing were developed for determination of the Pu content at U : Pu ratios of 40 : 1, 20 : 1, and 1 : 1. Precision determination of Pu(VI) with a relative root-mean-square deviation (RRMSD) < 0.2% from intrinsic absorption is possible without separation of U with the use of calibration solutions containing U. Under the same conditions, microgram amounts of Pu(IV) in the presence of U (U : Pu = 20 : 1) can be determined with an organic reagent, carboxyarsenazo, with RRMSD of 0.33 0.5%. Both versions were successfully applied to analysis of large size dried (LSD) spikes containing 40 mg of U and 2 mg of Pu. All the measurements were carried out on a two-channel spectrophotometric analyzer.

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Section: Version B Analysis Of Pu In the Presence Of U With Carboxyamentioning

confidence: 99%

“…GRIGOR'EVA et al With a further increase in acidity of the solution, the optical density gradually decreases [9,10]. The presence of a 20-fold excess of U affects D 675 insignificantly (spectrum 2).…”

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confidence: 99%