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

Food Chemistry
Yang WangXiaoya Hu

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.

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Citations

Jul 4, 2015·Analytical Chemistry·Fernando MayaGemma Turnes Palomino
Jul 6, 2018·Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment·Xue WangZhi-Qi Zhang
Feb 26, 2019·Environmental Science and Pollution Research International·Aisha Mohammed Al'AbriNor Kartini Abu Bakar
Jul 28, 2019·Mikrochimica Acta·Beshare Hashemi, Shahabaldin Rezania
Nov 8, 2019·Critical Reviews in Analytical Chemistry·Samin HamidiNegin Mazouchi
Jan 1, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Natalia ManousiGeorge A Zachariadis
Aug 28, 2020·Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association·Wajid Ali KhanMustafa Soylak
Mar 21, 2021·Food Chemistry·Anna MagriTomy J Gutiérrez
Jul 31, 2019·Chemical Reviews·Pei-Long WangHong-Cai Zhou

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