Colorimetric Determination of Moderate Concentration of Uranium in Perchloric Acid Solutions

Silverman, Louis; Moudy, L. A.

doi:10.1021/ac60109a014

Cited by 13 publications

(7 citation statements)

References 6 publications

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“…In organic solvents like TBP and DMSO for example, UO 2 (ClO 4 ) 2 dissociates completely and free uranyl is solvated by four solvent molecules, although in the case of acetonitrile there is a competition between the perchlorate ions and solvent molecules. 29,36 The fact that the [UO 2 Cl 4 ] 2À complex is only formed after addition of an excess of chloride ions is in agreement with this. Here, the uranyl ion is always coordinated with four chloride ions.…”

Section: Discussionsupporting

confidence: 61%

“…For a long time these intense peaks were considered as the ultimate evidence for the formation of [UO 2 Cl 3 ] À with D 3h symmetry in organic solvents. 1,4,28,29 Indeed, such sharp peaks in the first part of the spectrum are typical for complexes exhibiting a trigonal symmetry such as [UO 2 (NO 3 ) 3 ] À and [UO 2 (CH 3 -COO) 3 ] À . 1,4,30,32,34 In D 3h symmetry, the S g þ !…”

Section: Discussionmentioning

confidence: 99%

“…Calcium chloride was added to promote the extraction of the solvate UO 2 Cl 2 (TBP) x . 28,29 UO 2 (NO 3 ) 2 (TBP) 2 . The solvate was prepared in an excess of tributylphosphate by dissolving UO 2 (NO 3 ) 2 Á6H 2 O in pure tributylphosphate.…”

Section: Methodsmentioning

confidence: 99%

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Spectroscopic properties of uranyl chloride complexes in non-aqueous solvents

Görller‐Walrand

Houwer

Fluyt

et al. 2004

Phys. Chem. Chem. Phys.

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The complex formation of uranyl with chloride ions in non-aqueous solvents (acetone, tributylphosphate and methyl-i-butylketone) was studied by absorption, luminescence and MCD spectroscopy. The maximal coordination of the uranyl ion by chloride ions in these organic solvents was found to be four, which is in agreement with single crystal data. The MCD spectra unambiguously exclude the existence of [UO 2 Cl 3 ] À with D 3h coordination symmetry. For the intermediately formed complexes we propose a structure of the type: UO 2 Cl 2 (solv) 4 , with an orthorhombic symmetry. For these intermediate complexes, the 19 500-22 000 cm À1 region of the absorption spectrum exhibits an intensity enhancement with respect to that of the solvated uranyl ion. This intensity enhancement as well as the increase in total luminescence intensity is explained in terms of vibronic coupling of the first electronic state (P g ) with the asymmetric stretching (n a :a 2u ) and the bending (n b :e u ) vibrations of the uranyl ion and the out-of-plane bending mode of the equatorial ligands (n 10 :b 1u ). The spectra are dominated by transitions arising from the s u þ d u configuration. The spectroscopic properties of the UO 2 Cl 2 (TBP) x complexes are compared with those of the UO 2 (NO 3 ) 2 (TBP) 2 complex (TBP ¼ tributylphosphate).

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Section: Discussionsupporting

confidence: 61%

Section: Discussionmentioning

confidence: 99%

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Spectroscopic properties of uranyl chloride complexes in non-aqueous solvents

Görller‐Walrand

Houwer

Fluyt

et al. 2004

Phys. Chem. Chem. Phys.

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“…Silverman and Moudy (2) have published a direct colorimetric determination of uranium in perchloric acid solution. They specify removal of sulfate before preparation of the colorimetric solution; however, Scott and Dixon (1) had shown that a considerable increase in sensitivity could be obtained by.adding sulfuric or phosphoric acid to aqueous solutions.…”

Section: Discussion and Resultsmentioning

confidence: 99%

Simple Determination of Uranium in Graphite

Rogers¹

1959

Anal. Chem.

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“…Reagents UO 2 (ClO 4 ) 2 Á6H 2 O was prepared by the method of Silverman and Moudy. 40 The detailed procedure of the preparation can be found in ref. 41.…”

Section: Methodsmentioning

confidence: 99%

On the site symmetry of uranyl crown compounds in solution

Houwer

Servaes

Görller‐Walrand

2003

Phys. Chem. Chem. Phys.

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The spectroscopic properties of two uranyl crown ether complexes, [UO 2 (18-crown-6)] 2+ and [UO 2 (dicyclohexano-18-crown-6)] 2+ , dissolved in acetonitrile and propylene carbonate were studied. UV/VIS and magnetic circular dichroism (MCD) spectra were recorded, as well as emission and excitation spectra. The inclusion complexes formed, have a distorted D 3d symmetry, which is common for a crown ether ring, coordinated with a central metal ion. The electronic transitions and vibrational progressions are identified in a D 1h , D 3d and D 3 distortion scheme. Relaxation of the selection rules by vibronic coupling with the fundamental vibrations of uranyl is discussed.

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Colorimetric Determination of Moderate Concentration of Uranium in Perchloric Acid Solutions

Cited by 13 publications

References 6 publications

Spectroscopic properties of uranyl chloride complexes in non-aqueous solvents

Spectroscopic properties of uranyl chloride complexes in non-aqueous solvents

Simple Determination of Uranium in Graphite

On the site symmetry of uranyl crown compounds in solution

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