Application of silica fume as a new SP-extractor for trace determination of Zn(II) and Cd(II) in pharmaceutical and environmental samples by square-wave anodic stripping voltammetry

In this work, silica fume (SF) is used as a solid-phase extractor for extraction of Zn(II) and Cd(II) from aqueous solutions. Characterization of SF is performed by Fourier transform infrared, X-ray diffraction, transmission and scanning electron microscopy. The optimum experimental conditions for t...

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Bibliographic Details
Published in:Applied water science 2017-05, Vol.7 (2), p.677-688
Main Authors: Ahmed, Salwa A., Gaber, Ahmed A. Abdel, Rahim, Asmaa M. Abdel
Format: Article
Language:English
Subjects:
Aquatic Pollution
Comparative Law
Earth and Environmental Science
Earth Sciences
Hydrogeology
Industrial and Production Engineering
International & Foreign Law
Nanotechnology
Original Article
Private International Law
Waste Water Technology
Water Industry/Water Technologies
Water Management
Water Pollution Control
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Summary:In this work, silica fume (SF) is used as a solid-phase extractor for extraction of Zn(II) and Cd(II) from aqueous solutions. Characterization of SF is performed by Fourier transform infrared, X-ray diffraction, transmission and scanning electron microscopy. The optimum experimental conditions for the two metal ions are investigated using batch and column techniques. The maximum adsorption capacity values are found to be 54.13 and 121.28 mg g −1 at the optimum pH 6.0 and 8.0 for Zn(II) and Cd(II), respectively. The equilibrium data are analyzed using the Langmuir, Freundlich, and Temkin isotherms by nonlinear regression analysis. Also, the kinetics analysis revealed that the overall adsorption process is successfully fitted with the pseudo-second-order model. The method is applied for determination of the target metal ions in pharmaceutical and environmental samples using square-wave anodic stripping voltammetry. The limit of detection (LOD) values are 0.102 and 1.43 × 10 −3  mg L −1 for Zn(II) and Cd(II), respectively. The percentage recovery values are 98.8–100.5 % which indicate the success of the proposed method for determination of Zn(II) and Cd(II) without interfering effects.
ISSN:2190-5487
2190-5495
DOI:10.1007/s13201-015-0281-3