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Solid Phase Extraction and Trace Monitoring of Cadmium Ions in Environmental Water and Food Samples Based on Modified Magnetic Nanoporous Silica Publisher



Omidi F1 ; Behbahani M2 ; Kalate Bojdi M3 ; Shahtaheri SJ4
Authors
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Authors Affiliations
  1. 1. Department of Occupational Health Engineering, School of Public Health, Shahroud University of Medical Sciences, Shahroud, Iran
  2. 2. Department of Chemistry, Shahid Beheshti University, Evin, Tehran, Iran
  3. 3. Faculty of Chemistry, Kharazmi (Tarbiat Moallem) University, Tehran, Iran
  4. 4. Department of Occupational Health Engineering, School of Public Health, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran

Source: Journal of Magnetism and Magnetic Materials Published:2015


Abstract

A new method has been developed for trace separation/preconcentration of cadmium ions using pyridine-functionalized magnetic nanoporous silica material (called Py-Fe3O4@MCM-41) as a new magnetic sorbent and their determination by flame atomic absorption spectrometry (FAAS). The Py-Fe3O4@MCM-41 sorbent was characterized by thermogravimetric analysis, differential thermal analysis, transmission electron microscopy, Fourier transform infrared spectrometry and X-ray diffraction. The modified Fe3O4@MCM-41 can be easily separated from an aqueous solution by applying an external magnetic field. Effects of pH, amount of functionalized Fe3O4@MCM-41, extraction time, type and quantity of eluent, desorption time, and interfering ions on the extraction efficiency were evaluated and optimized. Under the optimized conditions, the detection limit and relative standard deviation was 0.04 μg L-1 and 2.9%, respectively and the maximum adsorption capacity of the synthesized sorbent for cadmium ions was 154 mg g-1. The proposed method has been applied to the determination of Cd ions at trace levels in real samples such as, rice, onion, carrot, lettuce, parsley, basil, tap water, river water and seawater with satisfactory results. © 2015 Elsevier B.V. Allrightsreserved.
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