The internal surface of a fused-silica capillary was made much more porous, more adsorptive and resistant to chemical and mechanical stresses by chemical coating using nanostructured octadecyl silica particles. The modification process was conducted using a simple and green nucleosynthesis procedure. The internally modified capillary was used as an in-tube solid-phase microextraction (IT-SPME) device for the extraction and preconcentration of ultratrace levels of polycyclic aromatic hydrocarbons (PAHs) in aqueous samples, followed by determination using gas chromatography-flame ionization detection (GC-FID) system. Morphology and structure of the sorbent was characterized by FT-IR, SEM and energy dispersive X-ray techniques. The effects of a range of experimental variables on the efficiency of the IT-SPME-GC-FID method were evaluated and optimized. Under the optimal conditions, good linearity (R2>0.99) was obtained for the calibration graphs over the range of 1-4000 ng mL−1. Detection limits were 0.22-0.47 ng mL−1 and relative standard deviations were obtained in the range 4.4-10.3%. Recoveries of the spiked samples were found to be 78.7-103.5%. The proposed IT-SPME-GC-FID strategy was applied successfully for the analysis of PAHs in real water samples. The results demonstrated good analytical performances, compared with those reported elsewhere for the sampling and quantification of PAHs in aqueous media.

中文翻译：

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用纳米结构十八烷基二氧化硅内部改性的熔融二氧化硅毛细管用于动态管内固相微萃取水介质中的多环芳烃

通过使用纳米结构的十八烷基二氧化硅颗粒进行化学涂层，熔融二氧化硅毛细管的内表面变得更加多孔、更具吸附性并且能够抵抗化学和机械应力。使用简单且绿色的核合成程序进行修饰过程。内部改性毛细管用作管内固相微萃取 (IT-SPME) 装置，用于萃取和预浓缩水样中超痕量多环芳烃 (PAH)，然后使用气相色谱-火焰电离检测器进行测定(GC-FID) 系统。吸附剂的形态和结构通过 FT-IR、SEM 和能量色散 X 射线技术表征。评估和优化了一系列实验变量对 IT-SPME-GC-FID 方法效率的影响。在最佳条件下，校准图在 1-4000 ng mL-1 范围内获得了良好的线性 (R2>0.99)。检测限为 0.22-0.47 ng mL-1，相对标准偏差范围为 4.4-10.3%。发现加标样品的回收率为 78.7-103.5%。所提出的 IT-SPME-GC-FID 策略已成功应用于实际水样中 PAH 的分析。与其他地方报道的水性介质中多环芳烃的采样和定量相比，结果表明其具有良好的分析性能。发现加标样品的回收率为 78.7-103.5%。所提出的 IT-SPME-GC-FID 策略已成功应用于实际水样中 PAH 的分析。与其他地方报道的水性介质中多环芳烃的采样和定量相比，结果表明其具有良好的分析性能。发现加标样品的回收率为 78.7-103.5%。所提出的 IT-SPME-GC-FID 策略已成功应用于实际水样中 PAH 的分析。与其他地方报道的水性介质中多环芳烃的采样和定量相比，结果表明其具有良好的分析性能。