Guangzhou Quality Supervision and Testing Institute, Guangzhou City Research Center of Risk Dynamic Detection and Early Warning for Food Safety, Guangzhou City Key Laboratory of Detection Technology for Food Safety, Guangzhou, Guangdong 511447, China.
Guangzhou Quality Supervision and Testing Institute, Guangzhou City Research Center of Risk Dynamic Detection and Early Warning for Food Safety, Guangzhou City Key Laboratory of Detection Technology for Food Safety, Guangzhou, Guangdong 511447, China.
Sci Total Environ. 2020 Jun 25;723:138103. doi: 10.1016/j.scitotenv.2020.138103. Epub 2020 Mar 21.
Most of the reported magnetic adsorbents are difficult to absorb multi-class of per- and polyfluoroalkyl substances (PFASs), especially the short-chain PFASs. In this work, a novel fluorine and nitrogen functionalized magnetic graphene (G-NH-FBC/FeO) was first synthesized and characterized by scanning electron microscope (SEM), Fourier Transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The as-prepared G-NH-FBC/FeO was utilized as adsorbents for the magnetic solid-phase extraction (MSPE) of 19 PFASs from water and functional beverages and showed excellent adsorption capacity probably due to the hydrophobic interaction. Under the optimal pretreatment and instrumental conditions, a selective and sensitive high performance liquid chromatography Orbitrap high resolution mass spectrometry (HPLC-Orbitrap HRMS) method was developed for the determination of PFASs. Results indicated that the proposed method had favorable linearity (R ≥ 0.994) within a wide range of concentrations. Limit of detection (LOD) and limit of quantification (LOQ) for the developed method ranged from 3 ng/L to 15 ng/L and 10 ng/L to 49 ng/L, respectively. Finally, the method was successfully applied to determine PFASs in drinking water, river water, tap water, factory drainage and functional beverages with recoveries ranging from 71.9% to 117.6% and relative standard deviation of <10%. The prepared G-NH-FBC/FeO was easy to recycle and could be reused for five times without significant decrease in extraction recoveries of PFASs. These results demonstrated that this novel magnetic G-NH-FBC/FeO could efficiently enrich PFASs and the proposed method is reliable and robust for the determination of PFASs in water and beverage samples.
大多数报道的磁性吸附剂难以同时吸附多类全氟和多氟烷基物质（PFASs），特别是短链 PFASs。在这项工作中，首次合成并通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）、X 射线衍射（XRD）和振动样品磁强计（VSM）对新型氟和氮功能化磁性石墨烯（G-NH-FBC/FeO）进行了表征。所制备的 G-NH-FBC/FeO 被用作从水中和功能饮料中磁性固相萃取（MSPE）19 种 PFASs 的吸附剂，由于疏水相互作用，其表现出优异的吸附能力。在最佳预处理和仪器条件下，开发了用于测定 PFASs 的高效液相色谱-轨道阱高分辨率质谱（HPLC-Orbitrap HRMS）选择性和灵敏的方法。结果表明，该方法在较宽的浓度范围内具有良好的线性（R≥0.994）。所开发方法的检测限（LOD）和定量限（LOQ）范围为 3ng/L 至 15ng/L 和 10ng/L 至 49ng/L。最后，该方法成功应用于测定饮用水、河水、自来水、工厂排水和功能饮料中的 PFASs，回收率在 71.9%至 117.6%之间，相对标准偏差小于 10%。制备的 G-NH-FBC/FeO 易于回收，可重复使用五次，对 PFASs 的萃取回收率没有明显降低。这些结果表明，这种新型磁性 G-NH-FBC/FeO 可以有效地富集 PFASs，所提出的方法是可靠和强大的，可用于测定水样和饮料样品中的 PFASs。
