Sensitivity and selectivity of the solid phase microextraction (SPME) in analysis are mostly determined by the coating material of the fiber used. Graphene oxide (GO) has attracted great attention because of its large specific surface area, rich oxygen functional groups, good dispersibility in aqueous solution and high reactivity. However, the low thermal stability of the functional groups limits the wide application of GO in SPME coating design. Highly cross-linked polyoxyethylene (POE) is a substrate widely used for composite material construction, which could significantly improve the thermal stability, water resistance as well as biocompatibility of the functional materials. In this study, we incorporated GO with highly cross-linked POE as a novel fiber coating material for SPME through the gluing approach. The obtained fiber possessed a wrinkled shape surface, which could increase the accessible surface area. In addition, the thermal and chemical stability of the fiber coating were also improved, rendering the fiber rigid enough for more than 100 repetitive extraction cycles. The performance of this developed SPME method for phenols was evaluated by headspace extraction of phenols in aqueous samples. Compared with three commercial fibers, the home-made fiber showed excellent extraction efficiencies towards phenols. Under the optimized conditions, it showed low detection limits (0.12-1.36 ng· L-1), good precision (<8.4%), good fiber-to-fiber repeatability (3.1%-8.1%), wide linear range (almost 5-1000 ng·L-1and correlation coefficients (R2) >99%), as well as good enrichment efficiencies (enrichment factors (EFs), 172-1752). Furthermore, the method was successfully applied in simultaneous analyses of five phenols for real water samples with satisfactory recoveries (81-113% for the Pearl River samples).

中文翻译：

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一种用于高效固相微萃取酚类的基于氧化石墨烯的聚合物复合涂层

分析中固相微萃取 (SPME) 的灵敏度和选择性主要取决于所用纤维的涂层材料。氧化石墨烯（GO）由于其比表面积大、含氧官能团丰富、在水溶液中分散性好、反应活性高而备受关注。然而，官能团的低热稳定性限制了 GO 在 SPME 涂层设计中的广泛应用。高度交联的聚氧乙烯（POE）是一种广泛用于复合材料构建的基材，可以显着提高功能材料的热稳定性、耐水性和生物相容性。在这项研究中，我们通过胶合方法将 GO 与高度交联的 POE 结合作为 SPME 的新型纤维涂层材料。获得的纤维具有皱纹形状的表面，这可以增加可及的表面积。此外，纤维涂层的热稳定性和化学稳定性也得到改善，使纤维具有足够的刚性，可承受 100 多次重复提取循环。通过顶空萃取水性样品中的苯酚来评估这种开发的 SPME 苯酚方法的性能。与三种商业纤维相比，自制纤维对酚类表现出优异的提取效率。在优化条件下，检测限低（0.12-1.36 ng·L-1），精密度好（<8.4%），光纤间重复性好（3.1%-8.1%），线性范围宽（近5 -1000 ng·L-1 和相关系数 (R2) > 99%），以及良好的富集效率（富集因子 (EFs)，172-1752）。此外，