Voltammetric determination of hafnium with calconcarboxylic acid

Levytska, Halyna; Orshuliak, Oksana

doi:10.1016/j.talanta.2006.06.036

Cited by 6 publications

(4 citation statements)

References 6 publications

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“…It is known that salicylic acid, containing COOH and OH groups bonded to adjacent carbon atoms of the aromatic ring, is a powerful complexing agent. , It is able to coordinate metals with complete deprotonation of the COOH and OH groups. Similar to salicylic acid, CCA was found to be a strong complexing agent, which was used for the voltammetric determination of Co, Cu, Ni, Ca, Zn, Pb, and Hf in solutions. , The suggested mechanism of salicylate-type bonding of CCA to MnO 2 particles is shown in Figure C. It involves the complexation of Mn atoms on the MnO 2 surface.…”

Section: Resultsmentioning

confidence: 99%

Electrophoretic Nanotechnology of Composite Electrodes for Electrochemical Supercapacitors

Zhitomirsky

2012

J. Phys. Chem. B

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The electrophoretic deposition (EPD) method has been developed for the fabrication of MnO(2)-multiwalled carbon nanotube (MWCNT) films for application in electrochemical supercapacitors (ESs). For MWCNT applications, which depend on electrical conductivity, it is challenging to achieve dispersion and EPD of pristine MWCNT and avoid defects due to chemical treatment or functionalization. An important finding was the possibility of efficient dispersion and controlled EPD of MWCNT using calconcarboxylic acid (CCA). Moreover, the use of CCA allowed efficient dispersion of MnO(2) in concentrated suspensions and EPD of MnO(2) films. The comparison of the experimental data for chromotrope FB (CFB) and CCA and chemical structures of the molecules provided insight into the mechanism of CCA adsorption on MnO(2). The fabrication of stable suspensions of MnO(2) nanoparticles containing MWCNT, and controlled codeposition of both materials is a crucial aspect in the EPD of composites. The new approach was based on the use of CCA as a charging and dispersing agent for EPD of MnO(2) nanoparticles and MWCNT. The deposition yield measurements at various experimental conditions and Fourier transform infrared spectroscopy data, coupled with results of electron microscopy, thermogravimetric, and differential thermal analysis provided evidence of the formation of MnO(2)-MWCNT composites. The electrochemical testing results and impedance spectroscopy data showed good capacitive behavior of the composite films and the beneficial effect of MWCNTs.

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Section: Resultsmentioning

confidence: 99%

Electrophoretic Nanotechnology of Composite Electrodes for Electrochemical Supercapacitors

Zhitomirsky

2012

J. Phys. Chem. B

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“…Overexposure to hafnium and its compounds could cause mild irritation of the eyes, skin, and mucous membranes [15]. Due to vital importance of hafnium determination in chemical, clinical and industrial analysis, many voltametric, conductometric, chromatographic and spectrometric techniques have been reported in the literatures [16][17][18][19][20][21], but most of them are sophisticated and suffer from the lack of reproducibility, so we were interested in preparation of a new solvent polymeric membrane electrode for selective monitoring of hafnium ion in solutions. In the present work, Mesaldpt that has been synthesized recently in our laboratories [22] was used as an excellent neutral ion carrier for construction of Scheme 1.…”

Section: Introductionmentioning

confidence: 99%

A fast response hafnium selective polymeric membrane electrode based on N,N′-bis(α-methyl-salicylidene)-dipropylenetriamine as a neutral carrier

Rezaei

Meghdadi

Zarandi

2008

Journal of Hazardous Materials

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“…Other instrumental techniques have difficulty in determining hafnium directly because of its very low content in nature and the presence of complex matrices. To solve these problems, various preconcentration and separation techniques, including solvent extraction, micelle extraction, solid phase extraction, , extraction chromatography, ion-exchange, and coprecipitation, have been developed.…”

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confidence: 99%

“…7 However, the content of hafnium is much lower than zirconium in geochemical samples, 8 and the detection limit (DL) of XRF is not low enough to determine the hafnium content. 9 In addition to XRF, neutron activation analysis (NAA), 10 voltammetry, 11 conductometry, 12 chromatography, 13 inductively coupled plasma atomic emission spectrometry (ICP-AES), 5,14 and inductively coupled plasma mass spectrometry (ICPMS) 15,16 have also been used for the determination of hafnium. Although NAA can be used for the direct determination of hafnium, it is time-consuming and expensive and is not suitable for geochemical samples requiring a large number of assays.…”

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confidence: 99%

Application of the Zr/Hf Ratio in the Determination of Hafnium in Geochemical Samples by High-Resolution Inductively Coupled Plasma Mass Spectrometry

Liu

et al. 2014

Anal. Chem.

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Hafnium content and its change are of significance in geochemistry and cosmochemistry; however, the determination of hafnium has always been problematic in analytical chemistry. In this paper, a new idea is proposed for the determination of hafnium in geochemical samples, including rocks, soils, and stream sediments. Through the comparison of two conventional open-type acid digestion methods (HF-HNO3-HClO4 and HF-HNO3-H2SO4), it was found that although neither of these methods could fully digest the zirconium and hafnium in a sample, the zirconium and hafnium digestion behaviors in one sample were consistent in the 60 experimental geochemical reference materials with different properties, so the experimentally determined Zr/Hf ratio in solution could be used to calculate the hafnium content in a sample. In addition, possible mass spectral interferences during the determination of zirconium and hafnium by high resolution inductively coupled plasma mass spectrometry (HR-ICPMS) were studied, and it was found that the mass spectral interferences of the selected isotopes (90)Zr and (178)Hf could be neglected. The mass spectral behaviors of (90)Zr and (178)Hf were also very consistent during the determination by HR-ICPMS. Since the hafnium content was calculated using the ratio value, all of the errors (including the errors in weighing process, the accidental errors during operation and the instrument fluctuation in the determination) of the Zr/Hf ratio could be effectively reduced or even eliminated. The relative standard deviation of the actual samples was lower than 3.2%, and the detection limit of the method (considering the dilution effect and matrix effect during measurement of the Zr/Hf ratio and zirconium content) was 0.04 μg/g. The proposed method could satisfy the requirement for the determination of hafnium in geochemical samples.

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Voltammetric determination of hafnium with calconcarboxylic acid

Cited by 6 publications

References 6 publications

Electrophoretic Nanotechnology of Composite Electrodes for Electrochemical Supercapacitors

Electrophoretic Nanotechnology of Composite Electrodes for Electrochemical Supercapacitors

A fast response hafnium selective polymeric membrane electrode based on N,N′-bis(α-methyl-salicylidene)-dipropylenetriamine as a neutral carrier

Application of the Zr/Hf Ratio in the Determination of Hafnium in Geochemical Samples by High-Resolution Inductively Coupled Plasma Mass Spectrometry

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