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Shokoofe Jahandari Mohammad Ali Taher Hamid Fazelirad Iran Sheikhshoai 《Mikrochimica acta》2013,180(5-6):347-354
We describe a silver(I)-selective carbon paste electrode modified with multi-walled carbon nanotubes and a silver-chelating Schiff base, and its electrochemical response to Ag(I). Effects of reduction potential and time, accumulation time, pH of the solution and the stripping medium were studied by differential pulse anodic stripping voltammetry and optimized. The findings resulted in a method for the determination of silver over a linear response range (from 0.5 to 235 ng?mL?1) and with a detection limit as low as 0.08 ng?mL?1. The sensor displays good repeatability (with the RSD of ±?2.75 % for 7 replicates) and was applied to the determination of Ag(I) in water samples and X-ray photographic films. Figure
Open circuit accumulation of Ag(I) onto a surface of EHPO-MCPE and determination by Differential pulse anodic stripping voltammetry 相似文献
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Rezaei Shokoofe Rahpeima Soraya Esmaili Javad Javanbakht Vahid 《Russian Journal of Applied Chemistry》2021,94(4):533-548
Russian Journal of Applied Chemistry - Magnetic nanoparticles and clay minerals combine to form a class of advanced nanocomposites that would possess exceptional adsorption, magnetism, and... 相似文献
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Shokoofe Jahandari Mohammad Ali Taher Hamid Fazelirad 《International journal of environmental analytical chemistry》2013,93(9):930-942
A new modified carbon paste electrode based on multi-walled carbon nanotube and Alizarin Red S acts as a chelating agent for tellurium(IV) ions, is described. The electrochemical responses were found to be analytically suitable to develop a method for the determination of tellurium at low concentration levels. Under optimised operational conditions, the sensor exhibited linear behaviour in the range of 2.0–300 ng mL?1 (correlation coefficient: 0.9982) with a detection limit of 0.45 ng mL?1. The results indicate that the sensor is sensitive and effective for the determination of tellurium in water samples and certified reference materials. 相似文献
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Behzad Rezaei Najmeh Majidi Shokoofe Noori Zuhair M. Hassan 《Journal of nanoparticle research》2011,13(12):6339-6346
Artemisinin regarded as one of the most promising anticancer drugs can bind to DNA with a binding constant of 1.04 × 104 M−1. The electrochemical experiments indicated that for longer incubation time periods, the reduction peak current of artemisinin
on carbon nanotube modified electrode increases. Therefore, the uptake of drug molecules from a solution into CNTs will be
achieved automatically by adsorption of 88.7% of artemisinin onto carbon nanotubes surface without alteration in drug properties.
Hence, capability of carbon nanotubes to have synergistic effect on the bioavailability of artemisinin was investigated. Experimental
tests on K562 cancer cell lines growth by MTT assay proved that multi-walled carbon nanotubes can enhance the cytotoxity of
artemisinin to the targeted cancer cells with unprecedented accuracy and efficiency. The IC50 values were 65 and 35 μM for artemisinin and artemisinin loaded on multi-walled carbon nanotubes, respectively; demonstrating
that artemisinin loaded on multi-walled carbon nanotubes is more effective in inhibition of cancer cell lines growth. 相似文献
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