The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Kazuhiko Tanaka - One of the best experts on this subject based on the ideXlab platform.
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High-speed simultaneous ion-exclusion/Cation-exchange chromatography of anions and Cations on a weakly acidic Cation-exchange resin column.
Journal of chromatography. A, 2003Co-Authors: Masanobu Mori, Kazuhiko Tanaka, Murad I H Helaleh, Qun Xu, Mikaru Ikedo, Yutaka Ogura, Shinji Sato, Wenzhi Hu, Kiyoshi Hasebe, Paul R HaddadAbstract:The simultaneous ion-exclusion/Cation-exchange separation column packed with a polymethacrylate-based weakly acidic Cation-exchange resin of 3 microm particle size was used to achieve the simultaneous high-speed separation of anions and Cations (Cl(-), NO3(-), SO4(2-), Na(+), K(+), NH4(+), Ca(2+) and Mg(2+)) commonly found in environmental samples. The high-speed simultaneous separation is based on a combination of the ion-exclusion mechanism for the anions and the Cation-exchange mechanism for Cations. The complete separation of the anions and Cations was achieved in 5 min by elution with 15 mM tartaric acid-2.5 mM 18-crown-6 at a flow-rate of 1.5 ml/min. Detection limits at S/N=3 ranged from 0.36 to 0.68 microM for anions and 0.63-0.99 microM for Cations. This method has been applied to the simultaneous determination of anions and Cations in several environmental waters with satisfactory results.
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high speed simultaneous ion exclusion Cation exchange chromatography of anions and Cations on a weakly acidic Cation exchange resin column
Journal of Chromatography A, 2003Co-Authors: Masanobu Mori, Kazuhiko Tanaka, Murad I H Helaleh, Qun Xu, Mikaru Ikedo, Yutaka Ogura, Shinji Sato, Wenzhi Hu, Kiyoshi Hasebe, Paul R HaddadAbstract:The simultaneous ion-exclusion/Cation-exchange separation column packed with a polymethacrylate-based weakly acidic Cation-exchange resin of 3 μm particle size was used to achieve the simultaneous high-speed separation of anions and Cations (Cl−, NO3−, SO42−, Na+, K+, NH4+, Ca2+ and Mg2+) commonly found in environmental samples. The high-speed simultaneous separation is based on a combination of the ion-exclusion mechanism for the anions and the Cation-exchange mechanism for Cations. The complete separation of the anions and Cations was achieved in 5 min by elution with 15 mM tartaric acid–2.5 mM 18-crown-6 at a flow-rate of 1.5 ml/min. Detection limits at S/N=3 ranged from 0.36 to 0.68 μM for anions and 0.63–0.99 μM for Cations. This method has been applied to the simultaneous determination of anions and Cations in several environmental waters with satisfactory results.
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simultaneous ion exclusion chromatography Cation exchange chromatography with conductimetric detection of anions and Cations in acid rain waters
Journal of Chromatography A, 1994Co-Authors: Kazuhiko Tanaka, Kazutoku Ohta, James S Fritz, Susumu Matsushita, Akiyoshi MiyanagaAbstract:Abstract A simple, selective and sensitive method was investigated for simultaneously determining anions (Cl−, NO3−, SO42−) and Cations (Na+, NH4+, K+, Mg2+, Ca2+) in acid rain and related environmental waters in central Japan. The method involves simultaneous ion-exclusion-Cation-exchange chromatography with conductimetric detection on a polyacrylate weakly acidic Cation-exchange resin column with a weak-acid eluent. With the weak-acid eluent (tartaric acid) both anions and Cations were separated simultaneously, based on ion-exclusion and Cation-exchange mechanism. Owing to the presence of H+ ions in the tartaric acid eluent, the detector response was positive for the anions and negative for the Cations. Using a 5 mM tartaric acid-7.5% methanol-water eluent, good simultaneous separation and detection were achieved in about 30 min. The results indicated an ionic balance of about 100% between the anions (including HCO3−) and the Cations (including H+).
Paul R Haddad - One of the best experts on this subject based on the ideXlab platform.
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High-speed simultaneous ion-exclusion/Cation-exchange chromatography of anions and Cations on a weakly acidic Cation-exchange resin column.
Journal of chromatography. A, 2003Co-Authors: Masanobu Mori, Kazuhiko Tanaka, Murad I H Helaleh, Qun Xu, Mikaru Ikedo, Yutaka Ogura, Shinji Sato, Wenzhi Hu, Kiyoshi Hasebe, Paul R HaddadAbstract:The simultaneous ion-exclusion/Cation-exchange separation column packed with a polymethacrylate-based weakly acidic Cation-exchange resin of 3 microm particle size was used to achieve the simultaneous high-speed separation of anions and Cations (Cl(-), NO3(-), SO4(2-), Na(+), K(+), NH4(+), Ca(2+) and Mg(2+)) commonly found in environmental samples. The high-speed simultaneous separation is based on a combination of the ion-exclusion mechanism for the anions and the Cation-exchange mechanism for Cations. The complete separation of the anions and Cations was achieved in 5 min by elution with 15 mM tartaric acid-2.5 mM 18-crown-6 at a flow-rate of 1.5 ml/min. Detection limits at S/N=3 ranged from 0.36 to 0.68 microM for anions and 0.63-0.99 microM for Cations. This method has been applied to the simultaneous determination of anions and Cations in several environmental waters with satisfactory results.
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high speed simultaneous ion exclusion Cation exchange chromatography of anions and Cations on a weakly acidic Cation exchange resin column
Journal of Chromatography A, 2003Co-Authors: Masanobu Mori, Kazuhiko Tanaka, Murad I H Helaleh, Qun Xu, Mikaru Ikedo, Yutaka Ogura, Shinji Sato, Wenzhi Hu, Kiyoshi Hasebe, Paul R HaddadAbstract:The simultaneous ion-exclusion/Cation-exchange separation column packed with a polymethacrylate-based weakly acidic Cation-exchange resin of 3 μm particle size was used to achieve the simultaneous high-speed separation of anions and Cations (Cl−, NO3−, SO42−, Na+, K+, NH4+, Ca2+ and Mg2+) commonly found in environmental samples. The high-speed simultaneous separation is based on a combination of the ion-exclusion mechanism for the anions and the Cation-exchange mechanism for Cations. The complete separation of the anions and Cations was achieved in 5 min by elution with 15 mM tartaric acid–2.5 mM 18-crown-6 at a flow-rate of 1.5 ml/min. Detection limits at S/N=3 ranged from 0.36 to 0.68 μM for anions and 0.63–0.99 μM for Cations. This method has been applied to the simultaneous determination of anions and Cations in several environmental waters with satisfactory results.
Masanobu Mori - One of the best experts on this subject based on the ideXlab platform.
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High-speed simultaneous ion-exclusion/Cation-exchange chromatography of anions and Cations on a weakly acidic Cation-exchange resin column.
Journal of chromatography. A, 2003Co-Authors: Masanobu Mori, Kazuhiko Tanaka, Murad I H Helaleh, Qun Xu, Mikaru Ikedo, Yutaka Ogura, Shinji Sato, Wenzhi Hu, Kiyoshi Hasebe, Paul R HaddadAbstract:The simultaneous ion-exclusion/Cation-exchange separation column packed with a polymethacrylate-based weakly acidic Cation-exchange resin of 3 microm particle size was used to achieve the simultaneous high-speed separation of anions and Cations (Cl(-), NO3(-), SO4(2-), Na(+), K(+), NH4(+), Ca(2+) and Mg(2+)) commonly found in environmental samples. The high-speed simultaneous separation is based on a combination of the ion-exclusion mechanism for the anions and the Cation-exchange mechanism for Cations. The complete separation of the anions and Cations was achieved in 5 min by elution with 15 mM tartaric acid-2.5 mM 18-crown-6 at a flow-rate of 1.5 ml/min. Detection limits at S/N=3 ranged from 0.36 to 0.68 microM for anions and 0.63-0.99 microM for Cations. This method has been applied to the simultaneous determination of anions and Cations in several environmental waters with satisfactory results.
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high speed simultaneous ion exclusion Cation exchange chromatography of anions and Cations on a weakly acidic Cation exchange resin column
Journal of Chromatography A, 2003Co-Authors: Masanobu Mori, Kazuhiko Tanaka, Murad I H Helaleh, Qun Xu, Mikaru Ikedo, Yutaka Ogura, Shinji Sato, Wenzhi Hu, Kiyoshi Hasebe, Paul R HaddadAbstract:The simultaneous ion-exclusion/Cation-exchange separation column packed with a polymethacrylate-based weakly acidic Cation-exchange resin of 3 μm particle size was used to achieve the simultaneous high-speed separation of anions and Cations (Cl−, NO3−, SO42−, Na+, K+, NH4+, Ca2+ and Mg2+) commonly found in environmental samples. The high-speed simultaneous separation is based on a combination of the ion-exclusion mechanism for the anions and the Cation-exchange mechanism for Cations. The complete separation of the anions and Cations was achieved in 5 min by elution with 15 mM tartaric acid–2.5 mM 18-crown-6 at a flow-rate of 1.5 ml/min. Detection limits at S/N=3 ranged from 0.36 to 0.68 μM for anions and 0.63–0.99 μM for Cations. This method has been applied to the simultaneous determination of anions and Cations in several environmental waters with satisfactory results.
Jean T Daou - One of the best experts on this subject based on the ideXlab platform.
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influence of the compensating Cation nature on the water adsorption properties of zeolites
Molecules, 2020Co-Authors: Zakaria Tahraoui, Habiba Nouali, Claire Marichal, Patrice Forler, Julien Klein, Jean T DaouAbstract:The influence of the compensating Cation (Na+, Li+, Mg2+) nature on the water adsorption properties of LTA and FAU-type zeolites was investigated. Cation exchanges were performed at 80 °C for 2 h using 1 M aqueous solutions of lithium chloride (LiCl) or magnesium chloride (MgCl2). XRF and ICP-OES analyses indicate that the Cation exchange yields reach values between 59 to 89% depending on the number of exchange cycles and the nature of the zeolite and Cation, while both zeolites structures are preserved during the process, as shown by XRD and solid state NMR analyses. Nitrogen adsorption-desorption experiments indicate a higher available microporous volume when sodium Cations are replaced by smaller monovalent lithium Cations or by divalent magnesium Cations because twice less Cations are needed compared to monovalent Cations. Up to 15% of gain in the available microporous volume is obtained for FAU-type zeolites exchanged with magnesium Cation. This improvement facilitates the adsorption of water with an increase in the water uptake up to 30% for the LTA and FAU type zeolites exchanged with magnesium. These exchanged zeolites are promising for uses in water decontamination because a smaller amount is needed to trap the same amount of water compared to their sodium counterparts.
Akiyoshi Miyanaga - One of the best experts on this subject based on the ideXlab platform.
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simultaneous ion exclusion chromatography Cation exchange chromatography with conductimetric detection of anions and Cations in acid rain waters
Journal of Chromatography A, 1994Co-Authors: Kazuhiko Tanaka, Kazutoku Ohta, James S Fritz, Susumu Matsushita, Akiyoshi MiyanagaAbstract:Abstract A simple, selective and sensitive method was investigated for simultaneously determining anions (Cl−, NO3−, SO42−) and Cations (Na+, NH4+, K+, Mg2+, Ca2+) in acid rain and related environmental waters in central Japan. The method involves simultaneous ion-exclusion-Cation-exchange chromatography with conductimetric detection on a polyacrylate weakly acidic Cation-exchange resin column with a weak-acid eluent. With the weak-acid eluent (tartaric acid) both anions and Cations were separated simultaneously, based on ion-exclusion and Cation-exchange mechanism. Owing to the presence of H+ ions in the tartaric acid eluent, the detector response was positive for the anions and negative for the Cations. Using a 5 mM tartaric acid-7.5% methanol-water eluent, good simultaneous separation and detection were achieved in about 30 min. The results indicated an ionic balance of about 100% between the anions (including HCO3−) and the Cations (including H+).
