Headspace Solid Phase Microextraction Based on Cu-Based MOFs for Extraction of Polycyclic Aromatic Hydrocarbons (PAHs) in Water Samples by Gas Chromatography

In the present work, we report a new kind of fiber coating material for solid-phase microextraction (SPME). For this purpose, Cu(OH)2 nanotube arrays were electrochemically synthesized by anodization of copper wire in an aqueous solution of KOH. The Cu(OH)2 nanotube arrays were used as Cu source that coordinated with an organic ligand to form MOF structure, as well as the substrate to support the growth of Cu-based MOF. The fiber-MOF was characterized by thermogravimetric analysis (TGA), energy dispersive X-ray Spectroscopy (EDS) and scanning electron microscopy (SEM) methods. Cu-based MOF used as a fiber coating for headspace solid-phase microextraction to the preconcentration and extraction of PAHs from water samples. The experimental conditions for microextraction such as stirring rate, pH value, extraction temperature and extraction time were optimized. Following thermal desorption, the PAHs were quantified by GC Technique. Under optimum conditions, the repeatability (%RSD) for one fiber (n = 3) was obtained from 6.3 to 8.6%. The detection limits are between 8 and 12 pg mL-1.