Extraction of microamounts of calcium, strontium and barium into nitrobenzene by using hydrogen dicarbollylcobaltate in the presence of dibenzo-18-crown-6

Makrlík, Emanuel; Vaňura, Petr; Selucký, P.

doi:10.1007/s10967-007-7115-1

Cited by 32 publications

(2 citation statements)

References 17 publications

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“…Crown compounds (L) extract alkali and alkaline-earth metal ions (M z+ ; z = 1, 2) from water into various diluents (Yajima et al, 2000;Takeda, 2002;Levitskaia et al, 2007;Makrlí k et al, 2008;Kudo et al, 1990;Kudo et al, 2017a;Kudo et al, 2017b;Zakurdaeva et al, 2018), such as nitrobenzene (NB) and chloroform (CF). Particularly, the extraction behaviors of alkali metal picrates (LiPic-CsPic) have been reported so far for L = 18-crown-6 ether (18C6) and its benzo-derivatives, benzo-18C6 (B18C6) and dibenzo-18C6 (DB18C6) (Takeda, 2002;Yajima et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Application of Molar Volumes Obtained From a Solvent Extraction Method for Estimation of Sizes of Metal Complexes With Crown Ethers in Phases

Kudo¹

2019

IJC

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Molar volumes (Vj) of ion-pair complexes (MLAz = j; z = 1, 2) and simple complex ions (CdL2+) without a pairing anion A− obtained at 298 K from the plots of the regular solution theory and the geometrical relation Vj = (4π/3)Rj3 were used for an estimation of their apparent radii (Rj) in liquid phases. Here, the cases for Mz+ = Li+-Cs+, Cd2+, and Pb2+ and L = 18-crown-6 ether (18C6) and benzo-18C6 (B18C6) with A− = Cl−-I− and picrate ion (Pic−) were examined. The thus-estimated Rj values were related to h(ML+), λmax, and (r+ + r−) values, where these symbols refer to the number of water molecules attached to the univalent complex ions, ML+, extracted into water-saturated nitrobenzene, absorption maxima of Pic− with ML+ in water-saturated chloroform, and the sum in an effective ionic radius, r+ or r−, between the central Mz+ and the pairing A−, respectively. The data points of j = Li(18C6)Pic, Na(18C6)Pic, M(B18C6)Pic with M = Na-Rb(I), Cd18C62+, Cd(18C6)Cl2, Cd(18C6)Br2, and Cd(18C6)I2 showed larger deviations from the line of Rj = (r+ + r−). While j = M(18C6)Pic with M = K-Cs(I) and M(18C6)Pic2 with Cd(II) and Pb(II) were on the line. It was demonstrated that essentially the former groups are present as water-separated and -shared ion pairs in the phases, while the latter ones as contact pairs.

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Section: Introductionmentioning

confidence: 99%

Application of Molar Volumes Obtained From a Solvent Extraction Method for Estimation of Sizes of Metal Complexes With Crown Ethers in Phases

Kudo¹

2019

IJC

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“…Chemical treatments for analysis of 90 Sr in water mainly include pre-concentration of strontium by precipitation [1][2][3] or cation exchange [4][5][6], and purification of strontium by selective precipitation [7,8], ion exchange [9,10], liquid-liquid extraction [11,12], or solid phase extraction [3,6,7,[13][14][15][16] etc. Horwitz et al [15] studied systematically on liquid-liquid extraction using crown ether as extractant, and developed a new extraction chromatography resin for selective separation of Sr.…”

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An improved procedure for determining 90Sr in groundwater based on cation-exchange enrichment and solid-phase extraction

Zhang

2015

J Radioanal Nucl Chem

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An improved procedure was developed using cation exchange enrichment and solid-phase extraction to determine 90 Sr in groundwater. Sr desorption from cation exchange column and sorption on Sr-resin column were carried out at the same time by stacking two cartridges in tandem and rinse with concentrated nitric acid, based on the fact that both the two operations are performed under high acid conditions. Some steps such as evaporating the eluate and dissolving again for Sr transfer, necessary in some standard methods, were skipped. The improved procedure was successfully applied to 90 Sr analysis in true monitor well water.

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Extraction of europium and cerium into nitrobenzene using synergistic mixture of hydrogen dicarbollylcobaltate and polyethylene glycol PEG 600

Makrlík

Vaňura

Sedláková

2009

J Radioanal Nucl Chem

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Extraction of microamounts of calcium, strontium and barium into nitrobenzene by using hydrogen dicarbollylcobaltate in the presence of dibenzo-18-crown-6

Cited by 32 publications

References 17 publications

Application of Molar Volumes Obtained From a Solvent Extraction Method for Estimation of Sizes of Metal Complexes With Crown Ethers in Phases

Application of Molar Volumes Obtained From a Solvent Extraction Method for Estimation of Sizes of Metal Complexes With Crown Ethers in Phases

An improved procedure for determining 90Sr in groundwater based on cation-exchange enrichment and solid-phase extraction

Extraction of europium and cerium into nitrobenzene using synergistic mixture of hydrogen dicarbollylcobaltate and polyethylene glycol PEG 600

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