A Nanospherical Metal–Organic Framework UiO-66 for Solid-Phase Microextraction of Polycyclic Aromatic Hydrocarbons

Polycyclic aromatic hydrocarbons are a low content, but highly toxic organic pollutant in the environment. Because of their great threat to the health and survival of humans and other creatures, it is necessary to have a very simple and convenient as well as highly sensitive method to detect them. Based on previous studies, a nanospherical metal–organic framework UiO-66 was re-applied as the solid-phase microextraction coating and the extraction performance of polycyclic aromatic hydrocarbons was investigated. Scanning electron microscope and X-ray diffraction were used to characterize the extraction material. The extraction conditions were optimized factor by factor, and the analytical method was established with broad linear ranges (0.03–50 and 0.10–50 µg L−1), excellent correlation coefficients (0.9955–0.9993) and low limits of detection (0.01–0.03 µg L−1). The analytical method was applied to detect polycyclic aromatic hydrocarbons in rainwater and lake water, and satisfactory results were obtained. Compared with previous reports, this method had wider linear range, lower limit of detection and longer service life.