Polydopamine (PDA)-coated magnetic multiwalled carbon nanotube (M-MWCNT) composites were synthesized in two facile preparation steps, and were used as adsorbents for magnetic solid-phase extraction (MSPE) coupled with high-performance liquid chromatography (HPLC) for simultaneous extraction, enrichment and determination of five kinds of typical chlorophenols (CPs) in water samples. The as-prepared magnetic composites showed excellent magnetic properties and high thermal stability. Various main parameters influencing the extraction efficiency of MSPE were systematically investigated. Under the optimized MSPE–HPLC conditions, a high enrichment factor (EF) was obtained in the range of 85–112 for 2-chlorophenol (2-CP), 4-chlorophenol (4-CP), 2,6-dichlorophenol (2,6-DCP), 2,4-dichlorophenol (2,4-DCP) and 2,4,6-trichlorophenol (2,4,6-TCP). Good linearity was obtained in the range of 2.0–200 μg L⁻¹ for 2-CP and 4-CP and 1.0–200 μg L⁻¹ for 2,6-DCP, 2,4-DCP and 2,4,6-TCP, with a correlation coefficient (R²) higher than 0.9964. The limits of detection (LODs) and the limits of quantification (LOQs) were in the range of 0.10–0.31 μg L⁻¹ and 0.35–1.03 μg L⁻¹, respectively. The intraday and interday precisions evaluated using relative standard deviation (RSD) values were in the range of 1.05–2.25% and 1.88–2.83%, respectively. The validated MSPE–HPLC method was also successfully applied to analyze five kinds of CPs in tap water, lake water, river water and seawater samples, and satisfactory recoveries were obtained in the range of 76.87–106.5% with RSDs of 1.64–6.78%.

中文翻译：

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聚多巴胺包覆磁性多壁碳纳米管复合材料磁性固相萃取结合高效液相色谱法测定氯酚

聚多巴胺 (PDA) 包覆的磁性多壁碳纳米管 (M-MWCNT) 复合材料通过两个简单的制备步骤合成，并用作磁性固相萃取 (MSPE) 与高效液相色谱 (HPLC) 联用的吸附剂水样中五种典型氯酚（CPs）的提取、富集与测定。所制备的磁性复合材料表现出优异的磁性能和高热稳定性。系统地研究了影响 MSPE 提取效率的各种主要参数。在优化的 MSPE-HPLC 条件下，2-氯苯酚 (2-CP)、4-氯苯酚 (4-CP)、2,6-二氯苯酚 (2 ,6-DCP)、2,4-二氯苯酚 (2,4-DCP) 和 2,4,6-三氯苯酚 (2,4,6-TCP)。^-1用于 2-CP 和 4-CP，1.0–200 μg L ^-1用于 2,6-DCP、2,4-DCP 和 2,4,6-TCP，相关系数 ( R ² ) 高于 0.9964 . 检测限 (LOD) 和定量限 (LOQ) 分别在 0.10–0.31 μg L ^-1和 0.35–1.03 μg L ^-1的范围内。使用相对标准偏差 (RSD) 值评估的日内和日间精密度分别在 1.05-2.25% 和 1.88-2.83% 的范围内。经验证的 MSPE-HPLC 方法还成功应用于分析自来水、湖水、河水和海水样品中的 5 种 CP，回收率在 76.87-106.5% 范围内，RSD 为 1.64-6.78%。