Technology Center of Anhui Entry-Exit Inspection and Quarantine Bureau, and Anhui Province Key Laboratory of Analysis and Detection for Food Safety, 329 Tunxi Road, Hefei, Anhui 230022, PR China.
Technology Center of Anhui Entry-Exit Inspection and Quarantine Bureau, and Anhui Province Key Laboratory of Analysis and Detection for Food Safety, 329 Tunxi Road, Hefei, Anhui 230022, PR China.
J Chromatogr A. 2018 Nov 30;1578:53-60. doi: 10.1016/j.chroma.2018.10.010. Epub 2018 Oct 10.
[60]Fullerene functionalized magnetic nanoparticles (FeO@SiO@C) were prepared and characterized by transmission electron microscope, vibrating sample magnetometer and infrared spectroscopy. The FeO@SiO@C was then applied for the magnetic solid-phase extraction of 16 priority pollutants polycyclic aromatic hydrocarbons (PAHs) in tea samples. The analyses were performed on gas chromatography-mass spectrometry (GC-MS) using selected ion monitoring (SIM) mode. Parameters affecting the extraction, including sorbent amount, desorption solvent, salt concentration, pH and extraction time were investigated. Under optimized conditions, the developed method based on FeO@SiO@C gave detection limits of 0.8-14.3 ng L, and quantification limits of 2.6-47.6 ng L for 16 PAHs, respectively. The spiked recoveries of the target PAHs in tea samples ranged from 92.4% to 106.9%. The intra-day and inter-day relative standard deviations (RSDs) were lower than 8.7% and 10.6%, respectively. These results demonstrated that the established method could be applied to the analysis of PAHs at trace level in tea samples.
[60]通过透射电子显微镜、振动样品磁强计和红外光谱对富勒烯功能化磁性纳米粒子（FeO@SiO@C）进行了制备和表征。然后，将 FeO@SiO@C 用于茶叶样品中 16 种优先污染物多环芳烃（PAHs）的磁性固相萃取。采用气相色谱-质谱（GC-MS）联用仪，选择离子监测（SIM）模式进行分析。考察了萃取过程中吸附剂用量、洗脱溶剂、盐浓度、pH 值和萃取时间等参数对萃取的影响。在优化条件下，基于 FeO@SiO@C 的方法对 16 种 PAHs 的检测限为 0.8-14.3ng L，定量限为 2.6-47.6ng L。茶叶样品中目标 PAHs 的加标回收率在 92.4%-106.9%之间。日内和日间相对标准偏差（RSD）分别低于 8.7%和 10.6%。这些结果表明，该方法可应用于茶叶样品中痕量 PAHs 的分析。
