title: Preparation of magnetic metal organic frameworks adsorbent modified with mercapto groups for the extraction and analysis of lead in food samples by flame atomic absorption spectrometry.
abstract: 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 μg 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 μg 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.
authors: Yangzhou University, College of Chemistry and Chemical Engineering, Yangzhou, China. Electronic address: wangyzu@126.com.
authors: Yang
authors: Y
authors: Wang
authors: Yangzhou University, College of Chemistry and Chemical Engineering, Yangzhou, China.
authors: Huanhuan
authors: H
authors: Chen
authors: Yangzhou Environmental Monitoring Center Station, Yangzhou, China.
authors: Jie
authors: J
authors: Tang
authors: Yangzhou University, College of Chemistry and Chemical Engineering, Yangzhou, China.
authors: Guiqin
authors: G
authors: Ye
authors: Yangzhou University, College of Chemistry and Chemical Engineering, Yangzhou, China.
authors: Huali
authors: H
authors: Ge
authors: Yangzhou University, College of Chemistry and Chemical Engineering, Yangzhou, China.
authors: Xiaoya
authors: X
authors: Hu
mesh_terms: D000327:Adsorption; D007854:Lead / Q000737:chemistry*; D008280:Magnetics; D008670:Metals / Q000737:chemistry*; D013054:Spectrophotometry, Atomic / Q000379:methods*; D013438:Sulfhydryl Compounds / Q000737:chemistry*
chemical_list: D008670:Metals; D013438:Sulfhydryl Compounds; D007854:Lead
keywords: Extraction; Flame atomic absorption spectrometry; Lead; Magnetic metal organic frameworks; Mercapto groups