Methods and experiments In this study, a functionalized multiwalled carbon nanotube (MWCNT)-coated solid-phase microextraction (SPME) fiber was developed for concentrating analytes in aqueous samples. Sodium deoxycholate (NaDC) was used as a dispersing agent for non-covalent modification of MWCNTs. The coating showed porous structure and large adsorption capacity. To investigate the capability of this MWCNTs/NaDC SPME fiber, it was applied to the analysis of phenols in aqueous solution. After extraction, the analytes were desorbed in an acetonitrile-water solution and analyzed using high-performance liquid chromatography. Results The MWCNTs/NaDC fiber exhibited good analytical performance, and fine preparation reproducibility was obtained with the relative standard deviations (RSDs) ranging from 4.9% to 10.2% (n = 6) in one batch, from 5.7% to 11.9% (n = 3) among different batches. Under the optimum extraction conditions, the detection limits were 0.15-0.30 ng/mL(S/N = 3), the linear detection ranges were 1-100 ng/mL (R2 ≥ 0.9997) for these analytes, and good recoveries (80.3-95.4%) were obtained for the spiked samples. Conclusion This is a simple and accurate pretreatment method for the analysis of phenols in aqueous samples.

中文翻译：

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一种基于涂有表面活性剂功能化多壁碳纳米管的纤维的简单策略，以改善水溶液中酚类的固相微萃取性能。

方法和实验 在本研究中，开发了一种功能化多壁碳纳米管 (MWCNT) 涂层固相微萃取 (SPME) 纤维，用于浓缩水样中的分析物。脱氧胆酸钠 (NaDC) 用作分散剂，用于 MWCNT 的非共价改性。涂层呈多孔结构，吸附量大。为了研究这种 MWCNTs/NaDC SPME 纤维的性能，将其应用于水溶液中酚类的分析。萃取后，分析物在乙腈-水溶液中解吸，并使用高效液相色谱法进行分析。结果 MWCNTs/NaDC纤维具有良好的分析性能，制备重现性好，相对标准偏差（RSDs）从4.9%到10.2%（n = 6）在一个批次，从5.7%到11。不同批次之间为 9% (n = 3)。在最佳提取条件下，这些分析物的检出限为0.15-0.30 ng/mL（S/N = 3），线性检测范围为1-100 ng/mL（R2≥0.9997），回收率良好（80.3- 95.4%）加标样品。结论 这是一种简单、准确的水样酚类分析前处理方法。