1-nitroso-2-naphthol impregnated multiwalled carbon nanotubes (NNMWCNTs) for the separation-enrichment and flame atomic absorption spectrometric detection of copper and lead in hair, water, and food samples

2017 ◽  
Vol 87 ◽  
pp. 285-291 ◽  
Author(s):  
M.A. Habila ◽  
E. Yilmaz ◽  
Z.A. AlOthman ◽  
M. Soylak
Keyword(s):  
Carbon Nanotubes ◽  
Atomic Absorption ◽  
Multiwalled Carbon Nanotubes ◽  
Food Samples ◽  
Multiwalled Carbon ◽  
Flame Atomic Absorption ◽  
Lead In Hair ◽  
Atomic Absorption Spectrometric

scholarly journals Separation and Preconcentration of Trace Amounts of Gold(III) Ions Using Modified Multiwalled Carbon Nanotube Sorbent Prior to Flame Atomic Absorption Spectrometry Determination

2010 ◽  
Vol 93 (4) ◽  
pp. 1287-1292 ◽  
Author(s):  
Daryoush Afzali ◽  
Sima Ghaseminezhad ◽  
Mohammad Ali Taher
Keyword(s):  
Carbon Nanotubes ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Multiwalled Carbon Nanotubes ◽  
Flow Rate ◽  
Absorption Spectrometry ◽  
Solid Sorbent ◽  
Multiwalled Carbon ◽  
Flame Atomic Absorption ◽  
Separation And Preconcentration

Abstract Multiwalled carbon nanotubes are attractive as sorbents for SPE because they can be used for enrichment of organic compounds and metal ions at trace levels. In this study, multiwalled carbon nanotubes were oxidized with concentrated HNO3, and then the oxidized multiwalled carbon nanotubes were modified with 5-(4-dimethylaminobenzyliden)-rhodanine. The modified multiwalled carbon nanotubes were used as a solid sorbent for separation and preconcentration of trace amounts of Au(III) ions. The sorption of Au(III) ions was quantitative in the pH range of 2.05.0, whereas quantitative desorption occurred instantaneously with 5.0 mL 2.0 M Na2S2O3. The eluted solution was aspirated directly into the flame for atomic absorption spectrometry. The proposed method resulted in an enrichment factor of 94. The RSD of the method was 1.11 (n = 10, 2.0 g/mL) and the LOD was 0.15 ng/mL. The calibration curve for Au(III) was linear between 0.53 ng/mL and 36.0 g/mL in the initial solution, with an R2 value of 0.9999. The sorbent capacity of the modified multiwalled carbon nanotubes was 7.3 mg Au(III)/g sorbent. The influences of the experimental parameters, including sample pH, sample flow rate, eluent volume and flow rate, sample volume, and interference of some ions on the recoveries of the Au ions, were investigated. The proposed method was applied for preconcentration and determination of Au in different samples.

Synthesis and Application of Glutaric Dihydrazide Modified Multiwalled Carbon Nanotubes for Selective Solid-Phase Extraction and Preconcentration of Cu(II), Zn(II), Ni(II), and Fe(III)

2012 ◽  
Vol 95 (3) ◽  
pp. 897-902 ◽  
Author(s):  
Hossein Tavallali ◽  
Saeed Zahmatkesh ◽  
Mehdi Aalaei ◽  
Dawood Abdardideh
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Solid Phase ◽  
Sample Volume ◽  
Multiwalled Carbon ◽  
Flame Atomic Absorption ◽  
Wastewater Samples ◽  
Spe Method ◽  
Atomic Absorption Spectrometric

Abstract An SPE method for selective separation-preconcentration of Cu(II), Zn(II), Ni(II), and Fe(III) on multiwalled carbon nanotubes (MWCNTs) modified by glutaric dihydrazide prior to flame atomic absorption spectrometric determination was investigated. The adsorption was achieved quantitatively on MWCNTs at pH 5.0, and then the retained metal ions on the adsorbent were eluted with 1 M HNO3. The effects of analytical parameters including pH of the solution, eluent type, sample volume, and matrix ions were investigated for optimization of the presented procedure. The adsorption capacity of the adsorbent at optimum conditions was found to be 33.6, 29.2, 22.1, and 36.0 mg/g for Cu(II), Zn(II), Ni(II), and Fe(III), respectively. The LOD values of the method were 0.21, 0.11, 0.24, and 0.27 μg/L for Cu(II), Zn(II), Ni(II), and Fe(III), respectively. The RSDs were lower than 3.01%. The method was applied for the determination of analytes in soil, river water, and wastewater samples with satisfactory results.

Green Dispersive Micro Solid-Phase Extraction using Multiwalled Carbon Nanotubes for Preconcentration and Determination of Cadmium and Lead in Food, Water, and Tobacco Samples

2020 ◽  
Vol 16 (4) ◽  
pp. 381-392
Author(s):  
Ayman A. Gouda ◽  
Ali H. Amin ◽  
Ibrahim S. Ali ◽  
Zakia Al Malah
Keyword(s):  
Carbon Nanotubes ◽  
Solid Phase Extraction ◽  
Multiwalled Carbon Nanotubes ◽  
Solid Phase ◽  
Certified Reference Materials ◽  
Phase Extraction ◽  
Multiwalled Carbon ◽  
Flame Atomic Absorption ◽  
Relative Standard ◽  
Separation And Preconcentration

Background: Cadmium (Cd2+) and lead (Pb2+) have acute and chronic effects on humans and other living organisms. In the present work, new, green and accurate dispersive micro solid-phase extraction (DμSPE) method for the separation and preconcentration of trace amounts of cadmium (Cd2+) and lead (Pb2+) ions in various food, water and tobacco samples collected from Saudi Arabia prior to its Flame Atomic Absorption Spectrometric (FAAS) determinations was developed. Methods: The proposed method was based on a combination of oxidized multiwalled carbon nanotubes (O-MWCNTs) with a new chelating agent 5-benzyl-4-[4-methoxybenzylideneamino)-4H- 1,2,4-triazole-3-thiol (BMBATT) to enrich and separate trace levels of Cd2+ and Pb2+. The effect of separation parameters was investigated. The validation of the proposed preconcentration procedure was performed using certified reference materials. Results: Analyte recovery values ranged from 95-102%, indicating that the method is highly accurate. Furthermore, precision was demonstrated by the relative standard deviation (RSD < 3.0%). The limits of detection were 0.08 and 0.1 μg L−1 for Cd2+ and Pb2+ ions, respectively. The preconcentration factor was 200. Conclusion: The proposed method was used for the estimation of Cd2+ and Pb2+ ion content in various real samples, and satisfactory results were obtained. The proposed method has high adsorption capacity, rapid adsorption equilibrium, extremely low LODs, high preconcentration factors and shortens the time of sample preparation in comparison to classical SPE.

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