Novel solid-phase microextraction fibers were fabricated by electrochemical deposition of cobalt on the pretreated nickel/titanium alloy (NiTi) fiber substrate and subsequent in situ growth of zeolitic imidazolate framework-67 (ZIF-67) followed by annealing treatment. The Co@ZIF-67 coating was used as a precursor and template for controlled fabrication of the Co@ZIF-67-derived coatings including Co@ZIF-67-Co₃O₄ and carbonaceous composite coatings. . The extraction performance of the Co@ZIF-67-derived coatings was evaluated using typical aromatic compounds coupled to high-performance liquid chromatography with UV detection. The results clearly demonstrate that the extraction selectivity is subject to the surface elemental composition of the ZIF-67-derived coatings. In view of long-term stability and good extraction selectivity, the Co@ZIF-67-C coating was selected for the enrichment and determination of polycyclic aromatic hydrocarbons (PAHs). Under the optimized conditions, the calibration curves were linear in the range of 0.05–100 μg•L⁻¹ with the correlation coefficients above 0.998. Limits of detection were 0.005–0.042 μg•L⁻¹. Furthermore, the intra-day and inter-day repeatability of the proposed method with the single fiber varied from 2.3% to 5.8% and from 3.3% to 6.9%, respectively. The fiber-to-fiber reproducibility ranged from 4.1% to 8.5%. The proposed method was suitable for selective enrichment and determination of target PAHs from real water samples. Moreover, the fabricated fiber showed precisely controllable growth and 150 extraction and desorption cycles.

新型固相微萃取纤维是通过将钴电化学沉积在预处理的镍/钛合金（NiTi）纤维基材上，然后在原位生长沸石咪唑酸酯骨架67（ZIF-67），然后进行退火处理而制成的。Co @ ZIF-67涂层用作可控制造Co @ ZIF-67-Co ₃ O ₄的Co @ ZIF-67衍生涂层的前体和模板和碳质复合涂料。。Co @ ZIF-67衍生涂层的萃取性能是通过将典型的芳族化合物与具有UV检测功能的高效液相色谱结合使用来评估的。结果清楚地表明，萃取选择性受ZIF-67衍生涂层的表面元素组成的影响。考虑到长期稳定性和良好的萃取选择性，选择了Co @ ZIF-67-C涂层来富集和测定多环芳烃（PAHs）。在最佳条件下，校正曲线在0.05–100μg•L ^-1范围内呈线性，相关系数大于0.998。检测限为0.005–0.042μg•L ^-1。此外，所提出的方法与单根纤维的日内和日间重复性分别从2.3％至5.8％和从3.3％至6.9％变化。光纤到光纤的重现性范围为4.1％至8.5％。该方法适用于从真实水样中选择性富集和测定目标多环芳烃。而且，制成的纤维显示出可精确控制的生长以及150个萃取和解吸循环。