Synergistic Ion-pair Extraction of Strontium Ion with Tri-n-octylphosphine Oxide and Dicyclohexano-18-crown-6

Onizaki, Mami; Morita, K.; Hirayama, Naoki

doi:10.2116/analsci.32.1367

ANAL. SCI.

2016

DOI: 10.2116/analsci.32.1367

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Synergistic Ion-pair Extraction of Strontium Ion with Tri-n-octylphosphine Oxide and Dicyclohexano-18-crown-6

Mami Onizaki

K. Morita

Naoki Hirayama

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2018

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Cited by 4 publications

(2 citation statements)

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“…Onizaki et al developed a synergistic extraction system of Sr(II) using tri-n-octylphosphine oxide (TOPO) and dicyclohexano-18-crown-6 (DC18C6) in the presence of the bis(trifluoromethanesulfonyl)imide anion (Tf2N -). 7 The authors demonstrated that the co-use of TOPO and DC18C6 drastically enhanced the extraction efficiency more than the sum of the extraction by the individual extractants based on additional formation concerning Sr(DC18C6)(TOPO) 2+ ·2Tf2Nand Sr(DC18C6)(TOPO)2 2+ ·2Tf2N -.Recently, ionic liquids (ILs) 8 and deep eutectic solvents (DESs) 9 have attracted much attention as alternatives to conventional organic diluents in solvent-extraction systems. Hirayama's group reported on the ionic liquid chelate extraction of Fe(III) using amphoteric 8-quinolinol (HQ).…”

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Solvent Extraction in Analytical Separation Techniques

Shimojo

2018

ANAL. SCI.

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1345Solvent extraction is one of the most effective analytical methods for the separation, purification, and removal of target metal ions (e.g. valuable metal ions, toxic metal ions and radioactive fission products) from aqueous solutions containing various metal ions. This technique has been widely used in many areas of chemistry, not only for the separation analysis of trace elements, but also for hydrometallurgy, metal recycling, and nuclear fuel processing. 1,2 Novel extractants and a synergistic extraction system have been developed to improve the extraction performance and separation ability for metal ions. Suzuki et al. reported on the separation of Am(III) and Eu(III) using an alkyldiamideaminetype extractant (ADAAM), which is a tridentate ligand composed of one soft N-donor atom and two hard O-donor atoms. 3 ADAAM showed a high extraction performance and selectivity for Am(III) over Eu(III) from a highly acidic solution, yielding a high separation factor of around 25. The authors assumed that the extraction behavior can be attributed to a combination effect between the coordination ability of two hard amide C=O donor groups for f-elements and the selectivity of one soft N-donor atom for Am(III). In addition, the authors reported continuously on the mutual separation of Am(III) and Cm(III) using ADAAM as an extractant and water-soluble diglycolamide ligand as a masking agent. 4 This combination provided high selectivity for Am(III) over Cm(III) with separation factors of up to 41. Narita et al. investigated the extraction behavior of Pd(II) from HCl and HBr solutions using N,N,N′,N′-tetra-2-ethylhexylthioglycol amide (TEHTDGA), which was compared with an extraction system using the conventional extractant, di-n-hexyl sulfide (DHS). 5 In the TEHTDGA system, the extractability of Pd(II) from a HBr solution was inferior to that from a HCl solution, which is opposite to the extraction behavior observed in the DHS system.FT-IR spectroscopy and EXAFS measurements indicated that the inner-sphere structure of Pd(II)-TEHTDGA complexes was almost the same as that of Pd(II)-DHS complexes in both cases of HCl and HBr solutions: two sulfur atoms directly coordinated to the Pd(II) ion by replacing two halide ions. Katsuta et al. reported on the extraction of Li + and Na + with a metallacrown in the presence of organic dye anions. 6 This system enabled selective Li + extraction and a spectrophotometric determination of Li + at the sub ppm level in seawater. Onizaki et al. developed a synergistic extraction system of Sr(II) using tri-n-octylphosphine oxide (TOPO) and dicyclohexano-18-crown-6 (DC18C6) in the presence of the bis(trifluoromethanesulfonyl)imide anion (Tf2N -). 7 The authors demonstrated that the co-use of TOPO and DC18C6 drastically enhanced the extraction efficiency more than the sum of the extraction by the individual extractants based on additional formation concerning Sr(DC18C6)(TOPO) 2+ ·2Tf2Nand Sr(DC18C6)(TOPO)2 2+ ·2Tf2N -.Recently, ionic liquids (ILs) 8 and deep eutectic solvents (DESs) 9 have attra...

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Solvent Extraction in Analytical Separation Techniques

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Ionic liquid-based dye: A “Dyed plasticizer” for rapid and highly sensitive anion optodes based on a plasticized PVC membrane

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On-line pseudo-stationary magnetic solid-phase extraction using magnetic cation exchange microparticles and its application to the determination of strontium

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Synergistic Ion-pair Extraction of Strontium Ion with Tri-n-octylphosphine Oxide and Dicyclohexano-18-crown-6

Cited by 4 publications

References 22 publications

Solvent Extraction in Analytical Separation Techniques

Solvent Extraction in Analytical Separation Techniques

Ionic liquid-based dye: A “Dyed plasticizer” for rapid and highly sensitive anion optodes based on a plasticized PVC membrane

On-line pseudo-stationary magnetic solid-phase extraction using magnetic cation exchange microparticles and its application to the determination of strontium

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