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On-Line Micro Column Preconcentration System Based on Amino Bimodal Mesoporous Silica Nanoparticles As a Novel Adsorbent for Removal and Speciation of Chromium (Iii, Vi) in Environmental Samples Publisher



Shirkhanloo H1, 2 ; Khaligh A3 ; Golbabaei F4 ; Sadeghi Z1 ; Vahid A2 ; Rashidi A2
Authors
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Authors Affiliations
  1. 1. Occupational and Environmental Health Research Center (OEHRC), Iranian Petroleum Industry Health Research Institute (IPIHRI-PIHO), 1485733111, Tehran, Iran
  2. 2. Research Institute of Petroleum Industry (RIPI), 14665-1137, Tehran, Iran
  3. 3. Department of Chemistry, Semnan University, Semnan, 35131-1911, Iran
  4. 4. Occupational Health Engineering Department, School of Public Health, Tehran University of Medical Sciences, 6446-14155, Tehran, Iran

Source: Journal of Environmental Health Science and Engineering Published:2015


Abstract

Abstract Background: Chromium (VI) has toxic and carcinogenic effects. So, determination and speciation of chromium in environmental samples is very important in view of health hazards. In this study, solid phase extraction (SPE) based on bulky amine-functionalized bimodal mesoporous silica nanoparticles (NH2-UVM-7) as a novel nanoadsorbent was applied for preconcentration and speciation of chromium (III, VI) in water samples. Methods: UVM-7 was synthesized via atrane route and subsequently functionalized with amino silane via grafting method. In SPE procedure, polymer tubing as a micro-column was filled with NH2-UVM-7 adsorbent. Preconcentration and speciation of Cr (III) and Cr (VI) ions with NH2-UVM-7 were obtained in water samples due to the fact that only Cr (VI) ions can be complexed with-NH2 groups at optimized pH. Finally, chromium concentration was determined by flame atomic absorption spectrometry (F-AAS). Results: TEM, XRD, and SEM results confirmed the beneficial properties of NH2-UVM-7 as the adsorbent for chromium extraction. Under the optimal conditions, linear calibration curve, detection limit and preconcentration factor were obtained 6-320 μg/ L, 1.2 μg/L and 66.7, respectively (RSD < 5 %). The efficiency of nanoadsorbent for preconcentration and extraction of Cr (VI) was 96 %, whereas it was less than 5 % for Cr (III). Conclusions: The developed NH2-UVM7-based SPE/F-AAS method has enough sensitively and simplicity for speciation and determination of Cr (VI) and Cr (III) ions in real water samples. Good recoveries, with low detection limits and good preconcentration factors are the main advantages of this procedure. © 2015 Shirkhanloo et al.; licensee BioMed Central.
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