论文题目: 十八烷基修饰氧化镁微球的制备、表征及其在色谱分析中的应用 Title：Preparation, characterization and application of octadecyl modified magnesium oxide microspheres 论文原创性说明: 通过简单方法制备出十八烷基修饰的氧化镁微球，通过一系列物理、化学方法对其表面特征和色谱性能进行了评价。研究发现：第一，该微球对于多环芳烃化合物表现出较强的保留作用，并且其色谱保留作用随着芳香环数和不饱和度的增加而增大；第二，将该材料用作液相色谱分析前的固相萃取材料，可以有效地富集环境水样中的多环芳烃。该色谱分析方法具有富集效率较高、选择性较好、分析成本较低的特点。 Abstract：A new solid-phase extraction sorbent, octadecyl modified magnesium oxide (C18-MgO) microspheres, was successfully prepared in the present work. Its composition, morphology and structure were studied by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), N2 adsorption–desorptiontechnique, and solid-statenuclearmagnetic resonance (NMR). The as-synthesized C18-MgO was employed as a solid-phase extraction sorbent for the enrichment of polycyclic aromatic hydrocarbons (PAHs) in aqueous solutions. Several factors affecting the extraction efficiency of PAHs, including the type and concentration of organic modifiers, flow rate, sample volume, and the types of rinsing solvents and eluting solvents, were investigated systematically. The results demonstrated that C18-MgO was superior to MgO in terms of large volume in loading samples. In comparison with MgO and Sep-Pak C18, C18-MgO exhibited excellent extraction efficiency (>91% except for naphthalene) in respect of high recoveries under the optimized conditions. The limits of detection varied from 0.001 to 0.603 ngmL−1 for 15 PAHs using high-performance liquid chromatography coupled with a fluorescencedetector, indicating that the analytical method was highly sensitive. The proposed method was applied to enrich PAHs in tap water and acceptable recoveries (18–96%) were obtained.
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