Kinetic Analysis of the Solvent Extraction of Cadmium(II) Complexes Using a Cadmium-deposited Recessed Microelectrode and Confocal Fluorescence Microscope

Nakatani, Kiyoharu; Sawada, Naoki; Sato, Tatsumi

doi:10.2116/analsci.33.1081

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…The dependence of Δ φ upon a NO 3 – in the aqueous and organic phases can be represented by the following equation: normalΔ ϕ = normalΔ ϕ NO 3 − ° − R T F nobreak0em.25em⁡ ln nobreak0em.25em⁡ a NO 3 − ( o ) a NO 3 − ( w ) where normalΔ ϕ NO 3 − ° is the standard ion-transfer potential of NO 3 – between the aqueous and organic phases (−0.270 V), R is the gas constant, T is the absolute temperature, F is the Faraday constant, and a NO 3 – (w) and a NO 3 – (o) are a NO 3 – in the aqueous and organic phases, respectively. In the current study, a NO 3 – (w) can be regarded as a constant because the volume of the aqueous phase (6.0 mL) is much larger than that of the TBP phase (10–50 μL) and the number of nitrate ions moving to the organic phase was small.…”

Section: Results and Discussionmentioning

confidence: 99%

Dynamic Interfacial Tension Measurement for the Kinetic Study of Eu(III) Extraction in the NaNO₃/Tributyl Phosphate System Based on an Increase in Interfacial Tension

Nishino,

Miyagawa,

Nagatomo

et al. 2024

Langmuir

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We demonstrated for the first time that interfacial tension measurements can be used to evaluate the kinetics of the solvent extraction of metal ions. The Eu(III) extraction mechanism in the nitrate ion/tributyl phosphate (TBP) system was investigated on the basis of dynamic interfacial tension. Interestingly, the interfacial tension of the TBP droplet (γ) increased with Eu(III) extraction. This behavior can be explained by the electrocapillary effect. The time dependence of γ was kinetically analyzed, and we demonstrated that the ratedetermining process was the interfacial reaction of Eu(III). Furthermore, the dependence of the mass transfer rate constant upon the concentration of the nitrate ions revealed that two nitrate ions were involved in the interfacial reaction during Eu(III) extraction. However, no change in the rate constant upon TBP concentration was observed, because the change in the TBP concentration did not affect the electrocapillary effect. We determined the forward and backward reaction rates to be k 1 = (1.5 ± 0.7) × 10 −6 m M −2 s −1 and k −MT = (6.9 ± 3.9) × 10 −7 m s −1 . Therefore, for the first time, we demonstrated that dynamic interfacial tension, which is involved in the electrocapillary effect, can be used to elucidate the kinetics of Eu(III) extraction. We expect that this study will attract the attention of researchers in several fields, including physical and analytical chemistry.

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Section: Results and Discussionmentioning

confidence: 99%

Dynamic Interfacial Tension Measurement for the Kinetic Study of Eu(III) Extraction in the NaNO₃/Tributyl Phosphate System Based on an Increase in Interfacial Tension

Nishino,

Miyagawa,

Nagatomo

et al. 2024

Langmuir

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“…A liquid–liquid phase system comprising two immiscible liquids is present in chemical and biological systems. The mass transfer through the interface in these systems influences the efficiency of the interfacial reaction and extraction process. − Chromatographic separation and solid extraction are related to the mass transfer because molecules are separated by repeated distribution in the pores of a porous medium followed by their subsequent release. Therefore, an understanding of the mass transfer mechanism is beneficial to biological, chemical, and industrial sciences.…”

Section: Introductionmentioning

confidence: 99%

Pore Size Dependence of Mass Transfer of Zinc Myoglobin in a Single Mesoporous Silica Particle

Miyagawa,

Nagatomo,

Kuno

et al. 2023

Langmuir

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This study investigated the pore size dependence of the mass transfer of zinc myoglobin (ZnMb) in a single mesoporous silica particle through confocal fluorescence microspectroscopy. The ZnMb's fluorescence depth profile in the particle was analyzed by a spherical diffusion model, and the intraparticle diffusion coefficient was obtained. The intraparticle diffusion coefficient in the silica particle with various pore sizes (10, 15, 30, and 50 nm) was furthermore analyzed based on a pore and surface diffusion model. Although the mass transfer mechanism in all silica particles followed the pore and surface diffusion model, the adsorption and desorption of ZnMb affected the mass transfer depending on the pore size. The influence of the slow desorption of ZnMb became pronounced for large pore sizes (30 and 50 nm), which was revealed by simulation using a diffusion equation combined with the adsorption−desorption kinetics. The distribution of ZnMb was suppressed in small pore sizes (10 and 15 nm) owing to the adsorption of ZnMb onto the entrance of the pore. Thus, we revealed the mass transfer mechanism of ZnMb in the silica particle with different pore sizes.

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“…The reaction rate and relative reaction rate have both been used to evaluate the reactions of various compounds. 8 , 9 , 10 , 11 , 12 , 13 , 14 These methods for reaction rates could be used to confirm whether other compounds are able to be measured by the analytical methods. We reported the relative rate constants for the DNPH derivatization reactions of formaldehyde, acetone, and acetaldehyde, by measuring the DNPH filter spiked with the sample.…”

Section: Introductionmentioning

confidence: 99%

“…The reaction rate and relative reaction rate have both been used to evaluate the reactions of various compounds 8‐14 . These methods for reaction rates could be used to confirm whether other compounds are able to be measured by the analytical methods.…”

Section: Introductionmentioning

confidence: 99%

Screening check test to confirm the relative reactivity and applicability of 2,4-dinitrophenylhydrazine impregnated-filters for formaldehyde on other compounds

Inoue

Takaya

2022

Journal of Occupational Health

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Objectives A simple check test method was designed to confirm whether a 2,4‐dinitrophenylhydrazine (DNPH) filter for formaldehyde can be used to measure other compounds. Methods Sample mixtures containing the same concentrations of formaldehyde, acetaldehyde, and acetone were spiked to the DNPH‐filter, extracted, and then measured using high performance liquid chromatography with photodiode array detector (HPLC‐PDA). The amounts of DNPH‐derivatives versus the amounts of spiked samples were then plotted. Results When the amount of DNPH << the total amount of spiked samples, the amount of DNPH‐derivatives was formaldehyde > acetaldehyde >> acetone. This order corresponded to the relative rate constants for the reaction. Therefore, this study confirmed that acetone was not collected at the formaldehyde sampling rate. Conclusions This check test easily measured the reaction rate order and can be used as a simple test to determine whether other samples can be measured by the analytical methods used for the specified sample.

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Kinetic Analysis of the Solvent Extraction of Cadmium(II) Complexes Using a Cadmium-deposited Recessed Microelectrode and Confocal Fluorescence Microscope

Cited by 6 publications

References 19 publications

Dynamic Interfacial Tension Measurement for the Kinetic Study of Eu(III) Extraction in the NaNO₃/Tributyl Phosphate System Based on an Increase in Interfacial Tension

Dynamic Interfacial Tension Measurement for the Kinetic Study of Eu(III) Extraction in the NaNO₃/Tributyl Phosphate System Based on an Increase in Interfacial Tension

Pore Size Dependence of Mass Transfer of Zinc Myoglobin in a Single Mesoporous Silica Particle

Screening check test to confirm the relative reactivity and applicability of 2,4-dinitrophenylhydrazine impregnated-filters for formaldehyde on other compounds

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Kinetic Analysis of the Solvent Extraction of Cadmium(II) Complexes Using a Cadmium-deposited Recessed Microelectrode and Confocal Fluorescence Microscope

Cited by 6 publications

References 19 publications

Dynamic Interfacial Tension Measurement for the Kinetic Study of Eu(III) Extraction in the NaNO3/Tributyl Phosphate System Based on an Increase in Interfacial Tension

Dynamic Interfacial Tension Measurement for the Kinetic Study of Eu(III) Extraction in the NaNO3/Tributyl Phosphate System Based on an Increase in Interfacial Tension

Pore Size Dependence of Mass Transfer of Zinc Myoglobin in a Single Mesoporous Silica Particle

Screening check test to confirm the relative reactivity and applicability of 2,4-dinitrophenylhydrazine impregnated-filters for formaldehyde on other compounds

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Dynamic Interfacial Tension Measurement for the Kinetic Study of Eu(III) Extraction in the NaNO₃/Tributyl Phosphate System Based on an Increase in Interfacial Tension

Dynamic Interfacial Tension Measurement for the Kinetic Study of Eu(III) Extraction in the NaNO₃/Tributyl Phosphate System Based on an Increase in Interfacial Tension