State Key Laboratory of Medicinal Chemical Biology, Nankai University, 94 Weijin Road, Tianjin 300071, China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), 94 Weijin Road, Tianjin 300071, China; Research Center for Analytical Sciences, College of Chemistry, Nankai University, 94 Weijin Road, Tianjin 300071, China.
State Key Laboratory of Medicinal Chemical Biology, Nankai University, 94 Weijin Road, Tianjin 300071, China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), 94 Weijin Road, Tianjin 300071, China; Research Center for Analytical Sciences, College of Chemistry, Nankai University, 94 Weijin Road, Tianjin 300071, China.
J Chromatogr A. 2014 Mar 21;1334:1-8. doi: 10.1016/j.chroma.2014.01.079. Epub 2014 Feb 7.
Metal-organic frameworks (MOFs) have received considerable attention as novel sorbents for sample preparation due to their fascinating structures and functionalities such as large surface area, good thermal stability, and uniform structured nanoscale cavities. Here, we report the application of a thermal and solvent stable MOF MIL-88B with nanosized bipyramidal cages and large surface area for solid-phase microextraction (SPME) of polychlorinated biphenyls (PCBs). Novel MIL-88B coated fiber was fabricated via an in situ hydrothermal growth of MIL-88B film on etched stainless steel fiber. The MIL-88B coated fiber gave large enhancement factors (757-2243), low detection limits (0.45-1.32ngL(-1)), and good linearity (5-200ngL(-1)) for PCBs. The relative standard deviation (RSD) for six replicate extractions of PCBs at 100ngL(-1) on MIL-88B coated fiber ranged from 4.2% to 8.7%. The recoveries for spiked PCBs (10ngL(-1)) in water and soil samples were in the range of 79.7-103.2%. Besides, the MIL-88B coated fiber was stable enough for 150 extraction cycles without significant loss of extraction efficiency. The developed method was successfully applied to the determination of PCBs in water samples and soil samples.
金属-有机骨架（MOFs）因其具有迷人的结构和功能，如大表面积、良好的热稳定性和均匀的纳米级空腔结构，而作为新型样品制备吸附剂受到了广泛关注。在此，我们报告了一种热稳定和溶剂稳定的 MOF MIL-88B 的应用，该 MOF 具有纳米级双锥笼状结构和大表面积，可用于固相微萃取（SPME）多氯联苯（PCBs）。通过在刻蚀不锈钢纤维上原位水热生长 MIL-88B 薄膜制备了新型 MIL-88B 涂层纤维。MIL-88B 涂层纤维对 PCBs 具有较大的增强因子（757-2243）、较低的检测限（0.45-1.32ngL(-1))和良好的线性范围（5-200ngL(-1))。在 MIL-88B 涂层纤维上以 100ngL(-1)浓度萃取 6 次 PCB 的相对标准偏差（RSD）为 4.2%-8.7%。在水和土壤样品中，加标 PCBs（10ngL(-1))的回收率在 79.7-103.2%范围内。此外，MIL-88B 涂层纤维在 150 次萃取循环后仍具有足够的稳定性，萃取效率无明显损失。该方法已成功应用于水样和土壤样品中 PCBs 的测定。
