Erciyes University, Faculty of Science, Chemistry Department, TR-38039 Kayseri, Turkey.
Erciyes University, Faculty of Science, Chemistry Department, TR-38039 Kayseri, Turkey.
Food Chem. 2018 Oct 15;263:232-239. doi: 10.1016/j.foodchem.2018.04.134. Epub 2018 May 1.
In the present study, core-shell FeO polydopamine nanoparticles were synthesized and used for the first time as an adsorbent for the vortex assisted magnetic dispersive solid phase extraction of copper from food samples. After elution, copper in the solutions was determined by FAAS. The adsorbent was characterized using X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller surface area, and zeta potential measurements. Various parameters affecting the magnetic dispersive solid-phase extraction were evaluated. The optimum pH and magnetic adsorbent amount were found to be 5 and 40 mg, respectively. Elution was made by 3 mL of 2 mol L HNO.The major advantage of the method is the fast equilibration during adsorption without the need for vortexing or shaking. The preconcentration factor and detection limit of the method were found to be 150 and 0.22 mg L, respectively. The precision (as RSD%) and adsorption capacity of the method were 3.7% and 28 mg g, respectively. The method was successfully verified by analyzing four certified reference materials (SPS-WW1 Batch 114 Wastewater, TMDA-53.3 Lake water, BCR-482 Lichen and 1573a Tomato Leaves) and by addition/recovery tests of copper standard solution in organic baby food, muesli, macaroni, honey, and milk samples.
在本研究中,合成了核壳型 FeO 聚多巴胺纳米粒子,并首次将其用作涡流辅助磁分散固相萃取食品样品中铜的吸附剂。洗脱后,用 FAAS 测定溶液中的铜。通过 X 射线衍射、扫描电子显微镜、能谱、傅里叶变换红外光谱、BET 表面积和zeta 电位测量对吸附剂进行了表征。考察了影响磁分散固相萃取的各种参数。结果表明,最佳 pH 值和磁性吸附剂用量分别为 5 和 40mg。用 3ml 2mol·L HNO3 进行洗脱。该方法的主要优点是吸附过程中快速达到平衡,无需涡旋或摇动。该方法的富集因子和检测限分别为 150 和 0.22mg·L。该方法的精密度(RSD%)和吸附容量分别为 3.7%和 28mg·g。该方法通过对四个认证参考物质(SPS-WW1 Batch 114 废水、TMDA-53.3 湖水、BCR-482 地衣和 1573a 番茄叶)进行分析以及对有机婴儿食品、麦片、通心粉、蜂蜜和牛奶样品中的铜标准溶液进行加标回收试验,验证了该方法的可行性。