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
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
复制标题
巯基修饰磁性金属有机骨架吸附剂的制备用于火焰原子吸收光谱法萃取分析食品样品中的铅
DOI：
10.1016/j.foodchem.2015.02.080
复制
发表时间：
2015-08-15
期刊：
影响因子：
8.8
通讯作者：
Hu, Xiaoya
中科院分区：
文献类型：
--
作者：
Wang, Yang;Chen, Huanhuan;Hu, Xiaoya
合成了一种新型的巯基修饰磁性金属有机骨架吸附剂，并将其用于痕量铅的萃取和光度测定。用傅里叶变换红外光谱仪、X射线衍射仪、扫描电子显微镜和振动样品磁强计对该吸附剂进行了表征。结果表明，由于金属阳离子与巯基之间的络合作用，该吸附剂对铅具有较高的吸附容量。同时，利用磁选法可以很容易地从水溶液中分离出吸附在吸附剂上的铅。在最佳条件下，L浓度在1~20微克范围内线性关系良好，富集度为100倍。铅的检出限和定量限分别为0.29和0.97mgL-1。方法用于食品样品和标准物质中痕量铅的测定，结果满意。(C)2015爱思唯尔有限公司。保留所有权利。
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.