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

Journal of Environmental Health Science Engineering

Alimorad Rashidi²  Amir Vahid²  Zargham Sadeghi⁴  Farideh Golbabaei³  Aisan Khaligh¹  Hamid Shirkhanloo² 

[1] Department of Chemistry, Semnan University, Semnan 35131-1911, Iran;Research Institute of Petroleum Industry (RIPI), Tehran 14665-1137, Iran;Occupational Health Engineering Department, School of Public Health, Tehran University of Medical Sciences, Tehran 6446-14155, Iran;Occupational and Environmental Health Research Center (OEHRC), Iranian Petroleum Industry Health Research Institute (IPIHRI-PIHO), Tehran 1485733111, Iran

关键词: Flame atomic absorption spectrometry;    Amine-functionalized UVM-7;    Solid phase extraction;    Removal;    Speciation;    Chromium;   

Others  :  1216880
DOI  :  10.1186/s40201-015-0205-z

 received in 2014-03-25, accepted in 2015-05-12,  发布年份 2015

【 摘 要 】

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.

【 授权许可】

   
2015 Shirkhanloo et al.; licensee BioMed Central.

【 图 表 】

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