Journal
FOOD CHEMISTRY
Volume 181, Issue -, Pages 191-197Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2015.02.080
Keywords
Magnetic metal organic frameworks; Mercapto groups; Extraction; Lead; Flame atomic absorption spectrometry
Funding
- National Natural Science Foundation of China [21205103, 21275124]
- Jiangsu Provincial Nature Foundation of China [BK2012258]
- Key Laboratory Foundation of Environmental Material and Engineering of Jiangsu Province [K13077]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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A novel magnetic metal organic frameworks adsorbent modified with mercapto groups was synthesized and developed for extraction and spectrophotometric determination of trace lead. The adsorbent was characterized by Fourier transforms infrared spectrometer, X-ray diffraction, scanning electron microscopy and vibrating sample magnetometry. The results indicated the adsorbents exhibited high adsorption capacities for lead due to the chelation mechanism between metal cations and mercapto groups. Meanwhile, the lead sorption onto the adsorbents could be easily separated from aqueous solution using a magnetic separation method. Under the optimal conditions, a linear calibration curve in the range from 1 to 20 mu g L-1 was achieved with an enrichment factor of 100. The limits of detection and quantitation for lead were found to be 0.29 and 0.97 mu g L-1, respectively. The developed method was successfully applied to the determination of trace amounts of lead in food samples and certified reference material with satisfactory results. (C) 2015 Elsevier Ltd. All rights reserved.
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