Spectrophotometric Titration of Cobalt(II) with CaCl2 in Mixed Solvents of 2-Propanol and Water for the Analysis of the Extraction Mechanism of Cobalt(II) by Salting-out in the Presence of CaCl2

Chung, Nguyen Huu; Wu, Ying; Tabata, Masaaki

doi:10.2116/analsci.21.1287

Cited by 3 publications

(2 citation statements)

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“…4,5 Darj and Malinowski analyzed visible spectra of a titration system containing copper(II), β-cyclodextrin and EDTA to determine some formation constants, 4 and Chung et al analyzed visible spectra of a titration system containing cobalt(II) and CaCl2 in a mixed solvent of 2-propanol and water to determine the formation constant of CoCl4 2-. 5 In these studies, the analysis of spectral data during a titration was, however, only utilized for determining the formation constants of complexes. In the present study, spectral data during EDTA titration were first utilized for a precise determination of an equivalence point.…”

Section: Introductionmentioning

confidence: 99%

Precise Chelatometric Titrations of Zinc, Cadmium, and Lead with Molecular Spectroscopy

2007

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Spectral data during a chelatometric titration were utilized for determining an equivalence point of the titration. Threedimensional titration data were analyzed by fitting to a theoretical equation that was derived from equilibrium equations among a metal ion, an indicator and EDTA. The equation with optimized parameters successfully explained the threedimensional titration data. This method was applied to EDTA titration systems of zinc, cadmium and lead with xylenol orange (XO) as an indicator. These systems were analyzed while taking the formation of 1:1 and 2:1 metal-indicator complexes into account. By this method, an accurate equivalence point was determined as well as stability constants and molar absorption spectra of metal-indicator complexes in each titration system. Moreover, the comparability among the concentrations of the metal standard solutions prepared from pure metals (Zn, Pb, and Cd) was also confirmed by the proposed evaluation method.

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Section: Introductionmentioning

confidence: 99%

Precise Chelatometric Titrations of Zinc, Cadmium, and Lead with Molecular Spectroscopy

2007

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“…4042) Although the specific adsorption of Cl ¹ ions on cobalt surface has not been investigated well, we believe that the adsorption of Cl ¹ ions is likely to occur during electrodeposition, since cobalt has a high affinity for chlorine, as evidenced by its tendency to form chloride complexes in the oxidized state. 43,44) Note that the metals that have been investigated for the specific adsorption of Cl ¹ ions tend to form chloride complexes in their oxidized states. 45) In our electrodeposition using HC solution, the presence of highly active Cl ¹ ions Table 4 Integrated intensities and fcc fractions of the cobalt electrodeposits using the HC solution (n = 3) at 50, 75, 100°C, and room temperature (RT).…”

Section: Relationship Between Hydrogen and The Crystalmentioning

confidence: 99%

Electrodeposition of Cobalt from LiCl-Based Highly Concentrated Aqueous Solution: Crystal Phase and Hydrogen Content

et al. 2023

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The relationship between the crystal phase and absorbed hydrogen in cobalt electrodeposited from a LiCl-based highly concentrated (HC) aqueous solution was investigated using X-ray diffraction and thermal desorption spectroscopy. We expected that the use of an HC solution would enable the electrodeposition of cobalt without hydrogen evolution and the concomitant hydrogen absorption. The current efficiency of cobalt deposition was more than 99% at potentials above ¹0.8 V vs. Ag/AgCl, indicating that hydrogen evolution is really suppressed, but the electrodeposited cobalt accompanied the fcc phase irrespective of the deposition temperature. Moreover, electrodeposited cobalt contained a large amount of hydrogen despite the high current efficiency. The hydrogen content of cobalt obtained at 100°C was approximately 10% of that obtained at room temperature; however, the fcc phase was still co-deposited, suggesting that factors other than hydrogen could be responsible for fcc-Co formation. The reason for hydrogen inclusion from the HC solution is discussed in terms of the hydrogen reduction mechanism.

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Interaction of Chromium(III) with Chrome Azurol S in Water–Glycerol Media

2010

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Spectrophotometric Titration of Cobalt(II) with CaCl2 in Mixed Solvents of 2-Propanol and Water for the Analysis of the Extraction Mechanism of Cobalt(II) by Salting-out in the Presence of CaCl2

Cited by 3 publications

References 21 publications

Precise Chelatometric Titrations of Zinc, Cadmium, and Lead with Molecular Spectroscopy

Precise Chelatometric Titrations of Zinc, Cadmium, and Lead with Molecular Spectroscopy

Electrodeposition of Cobalt from LiCl-Based Highly Concentrated Aqueous Solution: Crystal Phase and Hydrogen Content

Interaction of Chromium(III) with Chrome Azurol S in Water–Glycerol Media

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