The composition of complexes in the organic phase during the extraction of Eu(III) and Am(III) by benzyldibutylamine and benzyltrialkylammonium nitrates

1986 ◽  
Vol 51 (4) ◽  
pp. 791-800
Author(s):  
Libor Kuča ◽  
Věra Jedináková ◽  
Lubomír Daňo
Keyword(s):  
Metal Complex ◽  
Organic Phase ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Phase Extraction ◽  
Salting Out ◽  
Nitrate Ions ◽  
Nitrate Complexes ◽  
Composition Of Complexes ◽  
Nitrate Solutions

The extraction of americium and europium from acid nitrate solutions by benzene solutions of benzyldibutylamine nitrate (I) and quaternary ammonium salts benzyllauryldimethylammonium nitrate (II) and benzyltrioctylammonium nitrate (III) has been studied. During extraction with I, {(R3NH+)2, Me(NO3)2-5} is formed in the organic phase, extraction with II yields {(R4N+), Me(NO3)-4} and {(R4N+)2, Me(NO3)2-5} is formed during extraction with III. The concentration of nitrate ions does not have an unambiguous effect on the stoichiometry of the extraction. In addition to favouring the formation of the nitrate complexes of Am3+ and Eu3+, which are extracted by amines, nitrate ions also have a nonspecific salting out effect. The changes in the water content in the organic phase in dependence on the concentration of the metal complex suggests that the complex of Eu with II is not hydrated in the organic phase.

Extraction of americium with benzyldibutylamine from nitrate solutions

1979 ◽  
Vol 44 (8) ◽  
pp. 2366-2372 ◽  
Author(s):  
Věra Jedináková ◽  
Jana Cibulková ◽  
Libor Kuča
Keyword(s):  
Nitric Acid ◽  
Chemical Analysis ◽  
Ir Spectra ◽  
Aqueous Phase ◽  
Organic Phase ◽  
Nuclear Fission ◽  
Salting Out ◽  
Nitrate Medium ◽  
Separation Factors ◽  
Nitrate Solutions

The extraction of Am(III) with benzyldibutylamine from nitrate medium was examined in dependence on the concentration of nitric acid, kind and concentration of the salting-out agent in the aqueous phase, and on the solvent. Am(III) is extracted into the organic phase in the form of {(R3NH+)α, Am(NO3)52-}. The IR spectra of the organic phase are discussed and confronted with the results of the chemical analysis of the organic phase. The extraction of Am(III) and of lanthanoids was found to be considerably higher than that of some products of corrosion and nuclear fission (Cs, Sr, Zr, Fe), which is documented by the high values of the separation factors.

scholarly journals 2,6-Diamino-1-N-methylpyrimidine as new fluorescent probe for palladium(II) determination using hyphenated technique

2017 ◽  
Vol 35 (7-8) ◽  
pp. 728-734
Author(s):  
Olesya Volovenko ◽  
Tetiana Keda ◽  
Natalia Skreminska ◽  
Demyd Milokhov ◽  
Olga Khilya ◽  
...  
Keyword(s):  
Complex Formation ◽  
Solid Phase ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Enhancement Effect ◽  
Spectroscopic Techniques ◽  
Phase Extraction ◽  
Luminescence Enhancement ◽  
Hyphenated Technique ◽  
Subsequent Elution

The selective and sensitive hyphenated technique for Pd(II) fluorescence and spectrophotometric determination was proposed. The procedure was based on preliminary solid-phase extraction of [PdCl4]2− onto silica modified with quaternary ammonium salts, with the subsequent elution from the surface by 2,6-diamino-1- N-methylpyrimidine solution and measurement of the fluorescence intensity. The luminescence enhancement effect of 2,6-diamino-1- N-methylpyrimidine in the presence of Pd(II) due to the complex formation was applied to the development of sorption-spectroscopic techniques for detecting trace amounts of palladium in solution.

Extraction of americium with benzyldimethyllaurylammonium nitrate from aqueous nitrate solutions

1979 ◽  
Vol 44 (6) ◽  
pp. 1900-1907 ◽  
Author(s):  
Věra Jedináková ◽  
Jana Cibulková ◽  
Libor Kuča
Keyword(s):  
Organic Solvents ◽  
Organic Phase ◽  
Infrared Spectra ◽  
Distribution Ratio ◽  
Analytical Data ◽  
The Other ◽  
Extraction System ◽  
Salting Out ◽  
Extraction Mechanism ◽  
Nitrate Solutions

The extraction of Am(III) with benzyldimethyllaurylammonium nitrate from acidic nitrate solutions was studied. The effects of the kind and concentration of the salting-out agent, of the organic solvents, and of the concentrations of the other components in the extraction system on the distribution ratio values and applicability of this extracting agent to the separation of americium from lanthanoids are discussed. From the analytical data on the organic phase and from the infrared spectra, the composition of the extractable associates and their extraction mechanism were established.

scholarly journals Extraction and spectrophotometric determination of Hg2+ as complex anion HgI3-

1997 ◽  
Vol 22 (0) ◽  
pp. 09-14 ◽  
Author(s):  
Zaida FERNÁNDEZ TERRA ◽  
Rubén DEL TÓRO DÉNIZ ◽  
Humberto VARELA DE MOYA
Keyword(s):  
Molecular Weight ◽  
Metal Complex ◽  
High Molecular Weight ◽  
Spectrophotometric Determination ◽  
Quaternary Ammonium ◽  
Complex Anion ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Beer’S Law

A method has been developed for the extraction and spectrophotometric determination of Hg2+ in a concentration range of 0.2-1.0 mg L-1; following the Lambert-Beer's law using high molecular weight quaternary ammonium salts dissolved in chloroform. The metal complex anion was determined in the extract in the region UV (260 nm).

Extraction and Determination of RDX and HMX in Water

1999 ◽  
Vol 34 (3) ◽  
pp. 533-544 ◽  
Author(s):  
Eny M. Vieira ◽  
Francis I. Onuska
Keyword(s):  
Sodium Chloride ◽  
Solid Phase Extraction ◽  
Ammonium Sulfate ◽  
Organic Phase ◽  
Lake Water ◽  
Energetic Materials ◽  
Solid Phase ◽  
Phase Extraction ◽  
Salting Out

Abstract The analysis of energetic materials such as RDX and HMX in water at trace levels was accomplished by using micro-extraction by miscible solvents, such as acetonitrile, 2-propanol and acetone, and salting out the organic phase. This paper compares the results obtained with solid-phase extraction (SPE) to those obtained by demixing techniques for spiked Milli-Q water and an unfiltered lake water. A review of the data indicates that demixing with acetonitrile-sodium chloride and 2-propanol ammonium sulfate gives better extraction recoveries than solid-phase extraction. Salting-out extractions are performed in less time and with less solvent than by SPE techniques.

Extraction of hafnium(IV) with organophosphorus reagents from solutions of mineral acids mixtures

1979 ◽  
Vol 44 (12) ◽  
pp. 3656-3664
Author(s):  
Oldřich Navrátil ◽  
Jiří Smola ◽  
Rostislav Kolouch
Keyword(s):  
Ionic Strength ◽  
Aqueous Phase ◽  
Organic Phase ◽  
Perchloric Acid ◽  
Synergic Effect ◽  
Salting Out ◽  
Initial Concentration ◽  
Mixed Complexes ◽  
Synergic Extraction ◽  
Mineral Acids

Extraction of hafnium(IV) was studied from solutions of mixtures of perchloric and nitric acids and of perchloric and hydrochloric acids for constant ionic strength, I = 2, 4, 6, or 8, and for cHf 4 . 10-4 mol l-1. The organic phase was constituted by solutions of some acidic or neutral organophosphorus reagents or of 2-thenoyltrifluoroacetone, 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone, or N-benzoyl-N-phenylhydroxylamine in benzene, chloroform, or n-octane. A pronounced synergic extraction of hafnium proceeds only on applying organophosphorus reagents from an aqueous phase whose acidity is not lower than 3M-(HClO4 + HNO3) or 5M-(HClO4 + HCl). The synergic effect was not affected markedly by a variation of the initial concentration of hafnium in the range 1 . 10-8 -4 .10-4 mol l-1, it lowered with increasing initial concentration of the organophosphorus reagent and decreasing concentration of the H+ ions. It is suggested that the hafnium passes into the organic phase in the form of mixed complexes, the salting-out effect of perchloric acid playing an appreciable part.

Extraction of Am(III) by benzyldibutylamine from nitrate solutions of lanthanides

1981 ◽  
Vol 46 (1) ◽  
pp. 194-200 ◽  
Author(s):  
Marta Vojtíšková ◽  
Věra Jedináková ◽  
Libor Kuča
Keyword(s):  
Nitric Acid ◽  
Nuclear Fuel ◽  
Organic Phase ◽  
Spent Nuclear Fuel ◽  
Optimum Conditions ◽  
Separation Factors ◽  
Nitrate Solutions

Benzyldibutylamine is a suitable extractant for the separation of Am(III) and Ln(III) from the acidic nitrate solutions. The effect of lanthanides and yttrium on the extraction of Am(III) has been followed under the conditions modelling the content of these components in the spent nuclear fuel. The separation factors αAm/Ln were evaluated for the optimum conditions found for the separation of Am(III) from the lanthanides. The coextraction of nitric acid and water into the organic phase is discussed.

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