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Boda A, Arora SK, Singha Deb AK, Jha M, Ali SM, Shenoy KT. Molecular modeling guided isotope separation of gadolinium with strong cation exchange resin using displacement chromatography. SEP SCI TECHNOL 2017. [DOI: 10.1080/01496395.2016.1260141] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- A. Boda
- Chemical Engineering Division, Bhabha Atomic Research Centre, HBNI, Mumbai, India
| | - S. K. Arora
- Chemical Engineering Division, Bhabha Atomic Research Centre, HBNI, Mumbai, India
| | - A. K. Singha Deb
- Chemical Engineering Division, Bhabha Atomic Research Centre, HBNI, Mumbai, India
| | - M. Jha
- Chemical Engineering Division, Bhabha Atomic Research Centre, HBNI, Mumbai, India
| | - Sk. M. Ali
- Chemical Engineering Division, Bhabha Atomic Research Centre, HBNI, Mumbai, India
| | - K. T. Shenoy
- Chemical Engineering Division, Bhabha Atomic Research Centre, HBNI, Mumbai, India
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Ismail I, Fawzy AS, Ahmad MI, Aly HF, Nomura M, Fujii Y. Isotope effects of neodymium in different ligands exchange systems studied by ion exchange displacement chromatography. J Adv Res 2013; 4:129-35. [PMID: 25685410 PMCID: PMC4260886 DOI: 10.1016/j.jare.2012.03.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Revised: 03/19/2012] [Accepted: 03/19/2012] [Indexed: 11/19/2022] Open
Abstract
The isotope effects of neodymium in Nd-glycolate ligand exchange system were studied by using ion exchange chromatography. The separation coefficients of neodymium isotopes, ε's, were calculated from the observed isotopic ratios at the front and rear boundaries of the neodymium adsorption band. The values of separation coefficients of neodymium isotopes, ε's, for the Nd-glycolate ligand exchange system were compared with those of Nd-malate and Nd-citrate, which indicated that the isotope effects of neodymium as studied by the three ligands takes the following direction Malate > Citrate > Glycolate. This order agrees with the number of available sites for complexation of each ligand. The values of the plate height, HETP of Nd in Nd-ligand exchange systems were also calculated.
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Affiliation(s)
- Ibrahim Ismail
- Chemical Engineering Department, Cairo University, Giza, Egypt
| | - Ahmed S. Fawzy
- Chemical Engineering Department, Cairo University, Giza, Egypt
| | | | | | - Masao Nomura
- Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Tokyo, Japan
| | - Yasuhiko Fujii
- Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Tokyo, Japan
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Zhang YH, Nomura M, Fujii Y, Oi T. Cerium isotope effects in Ce(III) malate and lactate complex formation studied by long-distance displacement chromatography. ISOTOPES IN ENVIRONMENTAL AND HEALTH STUDIES 2006; 42:279-88. [PMID: 16870563 DOI: 10.1080/10256010600850290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Isotope effects of cerium were observed in malate and lactate complex formations during the long-distance displacement chromatographic processes at 313 K. Heavier isotopes were found fractionated in the frontal edges of the Ce adsorption bands in both the systems, registering a preference of the heavier isotopes for the Ce(III) complexes in the solution phase over the simply hydrated Ce(III) ions in the resin phase. The fractionation coefficients epsilon for the 136Ce/140Ce, 138Ce/140Ce and 142Ce/140Ce isotopic pairs were 7.1 x 10(-6), 5.2 x 10(-6) and -2.1 x 10(-6) for the malate system, and 4.8 x 10(-6), 4.5 x 10(-6) and-2.6 x 10(-6) for the lactate system, respectively. They all show the mass-dependent law if the deviation of epsilon for the 138Ce/140Ce pair was considered merely due to the isobaric interference in Ce isotopic ratio measurements, suggesting the molecular vibration, rather than the nuclear field shift, mainly contributes to the Ce isotope effects in the complex formation systems. The absolute values of epsilon between the two systems are comparable, suggesting no instinct difference in structural properties between Ce malate and lactate complexes involved.
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Affiliation(s)
- Yong-Hong Zhang
- Faculty of Science and Technology, Sophia University, Tokyo, Japan.
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Valleix A, Carrat S, Caussignac C, Léonce E, Tchapla A. Secondary isotope effects in liquid chromatography behaviour of 2H and 3H labelled solutes and solvents. J Chromatogr A 2006; 1116:109-26. [PMID: 16631181 DOI: 10.1016/j.chroma.2006.03.078] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2004] [Revised: 03/01/2006] [Accepted: 03/10/2006] [Indexed: 11/16/2022]
Abstract
The separation of solutes that differ only in the extent of isotopic substitution of their hydrogen atoms, using either mixtures of isotopically non-modified or perdeuterated solvents as mobile phases, is described. The occurrence of a secondary isotope effect is demonstrated in reversed-phase liquid chromatography, which is independent of the nature of the stationary phase (different octadecyl-bonded silicas, an embedded alkylamide-bonded silica, as well as one polymeric stationary phase were tested), and the water content and the nature of organic modifier of the mobile phase. The separation of 24 structurally different isotopologue pairs (apolar compounds and polar compounds with exchangeable or non-exchangeable hydrogen atoms) is examined using reversed-phase liquid chromatography. It is found that the greater the number of isotopically substituted hydrogen atoms in a given organic solute, the better is the separation of a particular isotopologue pair. The single secondary isotope effect is shown to be dependent on the number of isotopic substitutions. The greater the number of these substitutions, the smaller is the single isotope effect. The single secondary isotope effect is higher for aromatic hydrocarbons than for aliphatic hydrocarbons. A secondary isotope effect is also observed in chiral chromatography and normal-phase liquid chromatography, as well as on changing the nature of the substituting isotope, i.e.: tritium instead of deuterium. Thus, we have demonstrated that the total secondary isotopic effect for hydrogen/tritium is higher than for hydrogen/deuterium. This isotope effect involves only the consequences of changes in interactions due to nuclear motions. Overall this study confirms the predominance of hydrophobic effects in retention processes in reversed-phase liquid chromatography. In reversed-phase liquid chromatography, a secondary isotope effect related to mobile phase composition is also observed. The behaviour of deuterium oxide and water in mobile phases of the same composition (%, w/w) is compared. Independent of the nature of the organic modifier (methanol, acetonitrile or ethanol), the effect of replacing H2O with 2H2O in the mobile phase, is an increase in the retention factors and an improvement in the chromatographic resolution of isotopologue pairs. This increase in the resolution is not accompanied by a change in the chromatographic selectivity. The measurement of liquid-liquid extraction coefficients proves that the effect is mainly due to the modification of the phase ratio. In general the effect of 2H-labelled solvents (2H2O and C2H3CN) as mobile phase components, compared to their isotopically non-modified isomers, can be rationalized on the basis of their lower polarisabilities. Overall the use of perdeuterated rather than isotopically non-modified solvents as mobile phase components leads to the most efficient separation systems.
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Affiliation(s)
- Alain Valleix
- Service de Marquage Moléculaire et de Chimie Bio Organique, CEA/Saclay F-91191 Gif-sur-Yvette, France
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Fujii T, Suzuki D, Gunji K, Watanabe K, Moriyama H, Nishizawa K. Nuclear Field Shift Effect in the Isotope Exchange Reaction of Chromium(III) Using a Crown Ether. J Phys Chem A 2002. [DOI: 10.1021/jp020740p] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Toshiyuki Fujii
- Fuel Cycle and Environment Division, Research Reactor Institute, Kyoto University, Noda, Kumatori, Sennan, Osaka 590-0494, Japan, Department of Environmental Sciences, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan, Department of Nuclear Engineering, Graduate School of Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan, and Department of Nuclear Engineering, Graduate School of Engineering, Osaka University, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Daisuke Suzuki
- Fuel Cycle and Environment Division, Research Reactor Institute, Kyoto University, Noda, Kumatori, Sennan, Osaka 590-0494, Japan, Department of Environmental Sciences, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan, Department of Nuclear Engineering, Graduate School of Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan, and Department of Nuclear Engineering, Graduate School of Engineering, Osaka University, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Katsubumi Gunji
- Fuel Cycle and Environment Division, Research Reactor Institute, Kyoto University, Noda, Kumatori, Sennan, Osaka 590-0494, Japan, Department of Environmental Sciences, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan, Department of Nuclear Engineering, Graduate School of Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan, and Department of Nuclear Engineering, Graduate School of Engineering, Osaka University, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kazuo Watanabe
- Fuel Cycle and Environment Division, Research Reactor Institute, Kyoto University, Noda, Kumatori, Sennan, Osaka 590-0494, Japan, Department of Environmental Sciences, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan, Department of Nuclear Engineering, Graduate School of Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan, and Department of Nuclear Engineering, Graduate School of Engineering, Osaka University, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hirotake Moriyama
- Fuel Cycle and Environment Division, Research Reactor Institute, Kyoto University, Noda, Kumatori, Sennan, Osaka 590-0494, Japan, Department of Environmental Sciences, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan, Department of Nuclear Engineering, Graduate School of Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan, and Department of Nuclear Engineering, Graduate School of Engineering, Osaka University, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kazushige Nishizawa
- Fuel Cycle and Environment Division, Research Reactor Institute, Kyoto University, Noda, Kumatori, Sennan, Osaka 590-0494, Japan, Department of Environmental Sciences, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan, Department of Nuclear Engineering, Graduate School of Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan, and Department of Nuclear Engineering, Graduate School of Engineering, Osaka University, Yamadaoka, Suita, Osaka 565-0871, Japan
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