Distribution of micro-amounts of europium in the two-phase water-HCl-nitrobenzene-N,N'-dimethyl-N,N'-diphenyl-2,6-dipicolinamide-hydrogen dicarbollylcobaltate extraction system

Extraction of micro-amounts of europium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B-) in the presence of N,N'-dimethyl- -N,N'-diphenyl-2,6-dipicolinamide (MePhDPA, L) was investigated. The equilibrium data were explained assuming that the species HL+, + HL2 , 3+ EuL2 and 3+ EuL3 are extracted into the organic phase. The values of the extraction and stability constants of the species in nitrobenzene saturated with water were determined.

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Calix[4]arene-crown-5 as a selective extraction reagents for K+/H+, Rb+/H+ and Rb+/Cs+ separations

Radiochimica Acta ◽

10.1515/ract-2020-0111 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Petr Vaňura ◽

Emanuel Makrlík ◽

Pavel Selucký

Keyword(s):

Stability Constants ◽

Aqueous Phase ◽

Organic Phase ◽

Selective Extraction ◽

Nitrobenzene Solution ◽

Two Phase ◽

Extraction Constants ◽

Exchange Extraction ◽

Phase Water ◽

The Stability

Abstract From extraction experiments, the exchange extraction constants corresponding to the general equilibriums M+ (aq) + NaL+ (org) ⇔ ML+ (org) + Na+ (aq) or M+ (aq) + CsL+ (org) ⇔ ML+ (org) + Cs+ (aq), which take place in the two-phase water–nitrobenzene extraction system (M+ = Li+, H3O+, Ag+, K+, NH4 +, Tl+, Rb+; L = calix[4]arene-bis crown5(1,3-alternate), 26,28-dipropoxycalix[4]arene-crown-5(1,3-alternate), 11,23-dibromo-25,28-dipropoxycalix[4]arene-crown-5 (1,3-alternate) and 1,3-alternate-25,27-dihydroxycalix[4]arene-crown-5; aq = aqueous phase, org = organic phase), were evaluated. The stability constants of the NaL+ and CsL+ complexes were calculated from the extraction of the respective picrates in the system of water–nitrobenzene solution of L. Further, the stability constants of the ML+ complexes in nitrobenzene saturated with water were determined. High selectivities were found in some systems under study.

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Extraction of Cesium with Bis[undecahydro-7,8-dicarbaundecaborato(2-)]cobaltate(1-) in the Presence of 18-Crown-6

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19982001 ◽

1998 ◽

Vol 63 (12) ◽

pp. 2001-2008 ◽

Cited By ~ 6

Author(s):

Petr Vaňura ◽

Emanuel Makrlík

Keyword(s):

Stability Constants ◽

Organic Phase ◽

Extraction And Stability Constants ◽

Nitrobenzene Solution ◽

Equilibrium Data

Extraction of cesium with a nitrobenzene solution of bis[undecahydro-7,8-dicarbaundecaborato(2-)]cobaltate(1-) in the presence of 18-crown-6 (18C6, L) has been investigated. The equilibrium data and typical dependences of the Cs distribution ratios on the analytical concentration of 18C6 in the system under study can be explained assuming that the complexes HL+, CsL+ and CsL2+ are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene saturated with water have been determined.

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Transfer of cesium ion from the aqueous phase into the mixed organic phase of a two-phase water/nitrobenzene-carbon tetrachloride extraction system

Journal of Radioanalytical and Nuclear Chemistry ◽

10.1007/bf02035316 ◽

1991 ◽

Vol 150 (2) ◽

pp. 303-308 ◽

Cited By ~ 1

Author(s):

A. Paulenová ◽

V. Švec ◽

R. Kopunec

Keyword(s):

Carbon Tetrachloride ◽

Aqueous Phase ◽

Organic Phase ◽

Extraction System ◽

Two Phase ◽

Cesium Ion ◽

Phase Water

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Calcium ionophore I as very effective extraction agent for trivalent europium and americium

Journal of the Serbian Chemical Society ◽

10.2298/jsc180219111m ◽

2019 ◽

Vol 84 (2) ◽

pp. 199-209

Author(s):

Emanuel Makrlík ◽

Petr Vaňura

Keyword(s):

Solvent Extraction ◽

Stability Constants ◽

Calcium Ionophore ◽

Extraction And Stability Constants ◽

Hydrogen Dicarbollylcobaltate ◽

Cationic Complex ◽

Complex Species ◽

Equilibrium Data ◽

Extraction Agent ◽

Europium And Americium

The solvent extraction of microamounts of Eu3+ and Am3+ from water into nitrobenzene by means of a mixture of hydrogen dicarbollylcobaltate (H+B-) and calcium ionophore I (marked as the ligand L) was investigated. The equilibrium data have been explained assuming that the species HL+, HL2 +,ML2 3+ and ML3 3+ (M3+: Eu3+ or Am3+) are extracted into the organic phase. The extraction and stability constants of the cationic complex species in nitrobenzene saturated with water have been determined and discussed. It was proven experimentally that the ligand L could be considered as a very strong receptor for Eu3+ and Am3+.

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Extraction of 133Ba with Bis[undecahydro-7,8-dicarbaundecaborato(2-)]cobaltate(1-) in the Presence of Dibenzo-18-crown-6

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19980338 ◽

1998 ◽

Vol 63 (3) ◽

pp. 338-346 ◽

Cited By ~ 4

Author(s):

Petr Vaňura ◽

Emanuel Makrlík

Keyword(s):

Stability Constants ◽

Extraction And Stability Constants ◽

Nitrobenzene Solution ◽

Nitrobenzene Phase ◽

Equilibrium Data

Extraction of barium with the nitrobenzene solution of bis[undecahydro-7,8-dicarbaundecaborato(2-)]cobaltate(1-) in the presence of dibenzo-18-crown-6 (DB18C6, L) has been investigated. The equilibrium data and typical maxima in the dependences of the Ba distribution ratios on the analytical concentration of DB18C6 in the system can be explained assuming that the species Ba2+, BaL2+, BaL22+, BaHL3+ and BaHL23+ to be extracted into the nitrobenzene phase. The values of extraction and stability constants of the species in nitrobenzene saturated with water have been determined.

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Extraction of strontium and barium salts by the nitrobenzene solution of dicarbolide in the presence of glymes

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19850581 ◽

1985 ◽

Vol 50 (3) ◽

pp. 581-599 ◽

Cited By ~ 41

Author(s):

Petr Vaňura ◽

Emanuel Makrlík

Keyword(s):

Stability Constants ◽

Organic Phase ◽

Equilibrium Constants ◽

Minor Role ◽

Nitrobenzene Solution ◽

Ligand Structure ◽

Stability Constants Of Complexes ◽

Separation Factors ◽

The Stability ◽

A Minor

Extraction of microamounts of Sr2+ and Ba2+ (henceforth M2+) from the aqueous solutions of perchloric acid (0.0125-1.02 mol/l) by means of the nitrobenzene solutions of dicarbolide (0.004-0.05 mol/l of H+{Co(C2B9H11)2}-) was studied in the presence of monoglyme (only Ba2+), diglyme, triglyme, and tetraglyme (CH3O-(CH2-CH2O)nCH3, where n = 1, 2, 3, 4). The distribution of glyme betweeen the aqueous and organic phases, the extraction of the protonized glyme molecule HL+ together with the extraction of M2+ ion and of the glyme complex with the M2+ ion, i.e., ML2+ (where L is the molecule of glyme), were found to be the dominating reactions in the systems under study. In the systems with tri- and tetraglymes the extraction of H+ and M2+ ions solvated with two glyme molecules, i.e., the formation of HL2+ and ML22+ species, can probably play a minor role. The values of the respective equilibrium constants, of the stability constants of complexes formed in the organic phase, and the theoretical separation factors αBa/Sr were determined. The effect of the ligand structure on the values of extraction and stability constants in the organic phase is discussed.

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Europium and cerium extraction by the nitrobenzene solution of dicarbolide in the presence of polyethylene glycols

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19860498 ◽

1986 ◽

Vol 51 (3) ◽

pp. 498-515 ◽

Cited By ~ 13

Author(s):

Emanuel Makrlík ◽

Petr Vaňura

Keyword(s):

Molecular Weight ◽

Polyethylene Glycol ◽

Organic Phase ◽

Perchloric Acid ◽

Equilibrium Constants ◽

Polyethylene Glycols ◽

Individual Species ◽

Nitrobenzene Solution ◽

Separation Factors ◽

Equilibrium Data

Extraction of Eu3+ and Ce3+ microamounts from 0.1-0.4M perchloric acid by the nitrobenzene solution of dicarbolide H+[Co(C2B9H11)2]- in the presence of polyethylene glycols (Mr = 200, 300, 400) has been studied. The equilibrium data and the typical maxima on the dependence of the metal distribution ratio on the total analytical concentration of polyethylene glycol in the system can be explained assuming that the species ML3+org, ML3+2org, ML3+3org, MLH2+-1org, and HL+org (where M3+ = Eu3+, Ce3+; L = polyethylene glycol) are extracted into the organic phase. The values of extraction and equilibrium constants in the organic phase were determined and the effect of the polyethylene glycol molecular weight on the equilibrium constants and on the abundances of individual species in the organic phase is discussed. It has been found that the addition of polyethylene glycol to the acid - nitrobezene - dicarbolide system increases the values of the separation factors αCe/Eu.

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