Spectrophotometric Determination of Cobalt(II) and Cyanocobalamin with Vanillilfluorone and Its Applications

Hoshino, Mitsuru; Matsushita, Momoka; Samma, Megumi; Asano, Motoki; Yamaguchi, Takako; Fujita, Yoshikazu

doi:10.1248/cpb.59.721

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…In order to fix the composition between U(VI) and 3,4-DHBTSC, Job`s method continuous variation and molar ratio methods were employed. In Job's continuous variation method [18], a series of solutions containing required concentration of 3,4-DHBTSC and varying concentration of the metal ion were taken in a 10 ml volumetric flask. The absorbance values of these solutions were measured in each case against the suitable reagent blank and the data is represented in the Fig.…”

Section: Stoichiometric Determination Of the Complexmentioning

confidence: 99%

Analytical Determination of Uranium (VI) by Spectrophotometry

Veeranna¹,

Prasad²,

Jonnadula³

2016

International Journal of Advanced Research in Chemical Science

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A new reagent namely 3,4-Dihydroxybenzaldehyde Thiosemicarbazone (3, synthesized by the authors for the determination of uranium(VI) in monazite sand, pitchblend ore, spiked water, human hair and human blood samples. A brown colored complex was formed between uranium(VI) and 3,4-DHBTSC in a media of pH 7. The developed method can be conveniently applied for the analytical determination of uranium (VI) in the concentration range 0.476 -4.760 µg/ml. The molar absorptivity and sandell`s sensitivity were found to be 2.0833x10 4 L/mol/cm and 0.0114 µg/cm 2 respectively. The proposed method was found to be linear (R>0.01), selective, accurate (recovery=<99.7%) and precise (RSD<1.1%) in the reported linear calibration line.

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Section: Stoichiometric Determination Of the Complexmentioning

confidence: 99%

Analytical Determination of Uranium (VI) by Spectrophotometry

Veeranna¹,

Prasad²,

Jonnadula³

2016

International Journal of Advanced Research in Chemical Science

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“…Spectrophotometry is the most common technique used for metal determination using various chromogenic reagents [1][2][3][4][5][6][7][8][9][10], owing to its simplicity and low cost. However, the spectrophotometric determination of metals in ultra trace level in solution is difficult due to various factors, particularly their low concentrations and matrix effects.…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric determination of iridium after complexation and membrane filtration

Amin

Zaafarany

2015

Analytical Chemistry Research

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a b s t r a c tA simple, ultra sensitive and selective method for the spectrophotometric determination of Ir 3+ in various synthetic and environmental samples was reported. The analyte ions were collected on a membrane filter in the form of their red complex with 5-(2-benzothiazolyl-azo)8-hydroxy-quinoline (BTAHQ), and the absorption spectra of the colored membrane filters were acquired. Effects of pH value, sample volume, and amount of BTAHQ were examined in order to optimize sensitivity. The interference by common other ions was eliminated using appropriate masking agents. The absorbance is linearly related to the concentration of Ir 3+ in the ranges from 0.1 to 0.8 lg/L, and from 1.0 to 7.0 lg/L, respectively, the correlation coefficients (R 2 ) being 0.9996 and 0.9994. The molar absorptivities were calculated to be 4.81 Â 10 5 and 4.26 Â 10 7 L mol À1 cm À1 at 563 nm, whereas Sandell sensitivity was found as 0.391 and 0.004 ng cm À2 , respectively. The novelty and advantages of the proposed method is the highly sensitivity of the proposed method compared with all previously cited methods for iridium determination. Under the optimal conditions, the detection limit is 0.03 lg/L. The recoveries in case of spiked samples are between 98.7% and 101.5%, and the relative standard deviations range from 1.21% to 1.75%. Ó 2015 Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/3.0/).

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Vortex-assisted low density solvent and surfactant based dispersive liquid–liquid microextraction for sensitive spectrophotometric determination of cobalt

2018

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This study describes the development of vortex-assisted low density solvent and surfactant based dispersive liquid-liquid microextraction (VALS-DLLME) for Co(II) prior to its spectrophotometric detection. The method consisted of the complexation of Co(II) with pyrocatechol violet (PV) followed by the preconcentration of the Co(II)-PV complex using VALS-DLLME and then an absorption measurement at 600 nm. The optimum conditions for complex formation were a 1 : 3 mole ratio of Co(II) and PV at pH 7.5, while the conditions for VALS-DLLME were 300 mL 1-dodecanol as extraction solvent, and 300 mL acetonitrile as dispersive solvent under a vortex for 20 s with the addition of cationic surfactant (0.02 mmol L À1 CTAB). Under the optimum conditions, good linearity was in the range of 0.1-10 mg L À1 , the enrichment factor (EF) was 13.5 and the low limit of detection (LOD) was 0.04 mg L À1 . The method was applied to the analysis of Co(II) in water, green leaf vegetable and vitamin B 12 samples. The proposed method provided good recoveries in the range of 86-104%, which were comparable to those obtained from flame atomic absorption spectrophotometry. Results and discussionOptimization for the formation of Co(II)-PV complex Absorption spectra. The Co(II)-PV complex has blue color with the maximum absorption wavelength at 590 nm, while PV is yellow color with the maximum absorption wavelength at 7244 | RSC Adv., 2018, 8, 7243-7251 This journal is Fig. 1 (a) Absorption spectra of Co(II)-PV complex at different concentrations of Co(II) obtained from direct analysis (left) and with VALS-DLLME (right). Conditions of complexation: molar ratio (Co(II) : PV) of 1 : 3, phosphate buffer pH 7.5. Condition of VALS-DLLME: 300 mL 1-dodecanol, 0.02 mmol L À1 CTAB, 300 mL acetonitrile, 0.2 g Na 2 SO 4 , vortex at 3200 rpm for 40 s. (b) Effect of the PV concentration. Conditions: 1.00 mg L À1 Co(II) and phosphate buffer pH 7.5. (c) Effect of pH. Conditions: 1.00 mg L À1 Co(II) and 0.06 mmol L À1 PV in phosphate buffer.This journal is

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Spectrophotometric Determination of Cobalt(II) and Cyanocobalamin with Vanillilfluorone and Its Applications

Cited by 4 publications

References 12 publications

Analytical Determination of Uranium (VI) by Spectrophotometry

Analytical Determination of Uranium (VI) by Spectrophotometry

Spectrophotometric determination of iridium after complexation and membrane filtration

Vortex-assisted low density solvent and surfactant based dispersive liquid–liquid microextraction for sensitive spectrophotometric determination of cobalt

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