Electrodeposition of zeolitic imidazolate framework coating on stainless steel wire for solid-phase microextraction of polycyclic aromatic hydrocarbons in water samples

Abstract

At present, electrochemical deposition has become a novel approach to manufacture metal–organic framework (MOF) coatings. Here, zeolitic imidazolate framework (ZIF) coating solid-phase microextraction fiber was prepared by electrochemical deposition method with stainless steel wire as the support. The fabrication process was proceeded without adding any supporting electrolyte or regulator, and the ZIF-8 coating fiber could be obtained at room temperature within 20 min. The main factors affecting the preparation of ZIF-8 coated fiber were optimized, including the type of zinc salt in the deposition solution, deposition voltage, and time. Finally, eight polycyclic aromatic hydrocarbons were used as simulated pollutants, and the performance of the fiber had been evaluated using HS-SPME-FID. The optimum extraction conditions of the SPME-GC-FID methods were stirring for 40 min at 70 °C. The linear range of the method was 0.05–50 μg/L, limits of detection were 0.010–0.054 μg/L, inter-batch, intra-day, and inter-day relative standard deviation was lower than 4.2%, 8.5%, and 9.5%, respectively. The service life of a single fiber exceeds 80 extraction/desorption cycles.