Magnetic Nanoparticles Coated with Ionic Liquid as a Sorbent for Solid Phase Extraction of Chromium(VI) Prior to Its Determination by Electrothermal Atomic Absorption Spectrometry

Karimi, Mehdi; Shabani, Ali Mohammad Haji; Dadfarnia, Shayessteh

doi:10.5935/0103-5053.20150263

Cited by 6 publications

(2 citation statements)

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“…The analytical performance of the proposed method was compared with other reported methods on speciation of chromium . The results are summarized in Supporting Information Table S3 and indicate that the proposed method has comparatively low detection limits and an appropriate preconcentration factor.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous speciation of inorganic chromium(III) and chromium(VI) by hollow‐fiber‐based liquid‐phase microextraction coupled with HPLC–UV

Yazdi

Yamini

2017

J of Separation Science

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The speciation of chromium(VI) and chromium(III) was investigated by using hollow fiber liquid-phase microextraction based on two immiscible organic solvents followed by high performance liquid chromatography with ultraviolet detection. In this method, chromium(VI) and chromium(III) reacted with ammonium pyrrolidine dithiocarbamate to produce hydrophobic complexes. Subsequently, the complexes were first extracted into a thin layer of organic solvent (n-dodecane) present in the pores of a porous hollow fiber, and then into a μL volume of an organic acceptor (methanol) located inside the lumen of the hollow fiber. Then, the extracting organic phase was injected into the separation column of the high-performance liquid chromatograph for the analysis of both chromium species. Effective parameters on extraction were optimized using one-variable-at-a-time method and central composite design. Under optimized conditions, a linear range of 0.25-100 and 0.5-100 μg/L (R > 0.998), the limits of detection of (S/N = 3) 0.08 and 0.1 μg/L and a preconcentration factor of 625 and 556 were achieved for chromium(VI) and chromium(III), respectively. The method was successfully applied to the speciation and determination of chromium species in different water samples and satisfactory results were obtained.

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Section: Resultsmentioning

confidence: 99%

Simultaneous speciation of inorganic chromium(III) and chromium(VI) by hollow‐fiber‐based liquid‐phase microextraction coupled with HPLC–UV

Yazdi

Yamini

2017

J of Separation Science

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“…Therefore, enrichment and separation are necessary in the determination to eliminate the matrix interference, to improve the sensitivity and reliability of the analytical method. In recent years, due to the unique structure and properties of nano γ-Al 2 O 3 , combining γ-Al 2 O 3 with high specific surface area and good adsorption performance in the analysis of pretreatment, nano γ-Al 2 O 3 has been pay extensive attention by scientific workers in some areas such as environment, materials, and analysis [13][14][15][16] . In order to investigate different quality of nano alumina for adsorption performance of Cr(VI), we use electronic analytical balance to weight 15, 20, 25 mg of nano alumina granular solid, put them in plastic centrifuge tube, add a certain amount of chromium(VI) solution, oscillate for 5 min, then centrifuge for 30 min to get the supernatant fluid (because it is difficult to make the solution clarifying by standing) to avoid the damage of ICP-MS by nano particles.…”

Section: Exploration Of Cr(vi) Adsorption Limit Of Granular and Dendrmentioning

confidence: 99%

Preconcentration and Separation of Cr(VI) Coupled with Controllable Synthesis of Nano γ-Al2O3 Materials

Wang¹,

Yuan²,

Weng³

et al. 2017

dtetr

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ABSTRACT The γ-alumina nano materials were acquired through hydrothermal method of controllable synthesis. Optimized methods were used to change the hydrothermal parameters on the synthesis of nano γ-Al 2 O 3 . The preconcentration performance of chromium(VI) was explored comparing with SDS and CTMAB in the presence of precursors which were prepared via Al(NO 3 ) 3 ·9H 2 O and CO(NH 2 ) 2 . 170 °C was selected as reaction temperature and SDS was chosen as surfactant. TEM images indicated that the average particle size of granular γ-Al 2 O 3 was between 100 nm to 400 nm whose dispersion tended to be good. After centrifugation, a certain volume of 2 mol·L -1 hydrochloric acid was used as eluent. At the same time, chromium(VI) adsorbed in granular γ-Al 2 O 3 aggregation was analyzed by inductively coupled plasma mass spectrometry. It was showed that the effect of branch type was not better than the granule type. The adsorption limit of Cr(VI) in γ-Al 2 O 3 synthesized by SDS was higher than that of CTMAB. Further experiments of the interfering elements showed that Sb, As, total Cr, Se in granular γ-Al 2 O 3 had higher adsorption rate, which could reach to 90% or more. When eight migrating elements shared some adsorption sites with Cr(VI), the adsorption rate and limitation reduced. The competitive adsorption effect of Ba, Cd, Pb and Hg had little impact on Cr(VI). As a result, this established method had reached the requirements of Cr(VI) combined with separation and detection in environmental sewage which could be used for analysis of other heavy metals.

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Speciation and determination of chromium ions by dispersive micro solid phase extraction using magnetic graphene oxide followed by flame atomic absorption spectrometry

Kazemi

Shabani

Dadfarnia

et al. 2017

International Journal of Environmental Analytical Chemistry

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Magnetic Nanoparticles Coated with Ionic Liquid as a Sorbent for Solid Phase Extraction of Chromium(VI) Prior to Its Determination by Electrothermal Atomic Absorption Spectrometry

Cited by 6 publications

References 0 publications

Simultaneous speciation of inorganic chromium(III) and chromium(VI) by hollow‐fiber‐based liquid‐phase microextraction coupled with HPLC–UV

Simultaneous speciation of inorganic chromium(III) and chromium(VI) by hollow‐fiber‐based liquid‐phase microextraction coupled with HPLC–UV

Preconcentration and Separation of Cr(VI) Coupled with Controllable Synthesis of Nano γ-Al2O3 Materials

Speciation and determination of chromium ions by dispersive micro solid phase extraction using magnetic graphene oxide followed by flame atomic absorption spectrometry

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