High efficiency enrichment and trace analysis of triazine herbicide residues are crucial for ensuring environmental and food safety. Herein, a series of magnetic hyper-crosslinked polymers (CD-gs-MHCPs) were synthesized with different crosslinkers, which might possess different pore structure and surface area, so they might dispay variable adsorption performance. CD-gs-MHCP2 with dichloroxylene as crosslinker delivered superior adsorption ability for triazine herbicides (THs). The synergistic effect of hydrogen bonds, hydrophobic interaction, π-π stacking interaction and pore adsorption were proved to be the main adsorption mechanism. Combined CD-gs-MHCP2 based magnetic solid-phase extraction (MSPE) with high-performance liquid chromatography, the quantitative analysis of THs in river water and vegetable samples (zucchini, pakchoi) was achieved. Under the optimal conditions, the enrichment factors for three different samples ranged from 94 to 244 and low detection limit (S/N = 3) of the four THs were obtained from 0.05 to 0.15 ng mL−1 for river water and 0.31–3.10 ng g−1 for vegetable samples. The method recoveries were in the range of 86.2 %–120 % with relative standard deviations lower than 7.4 %. This work not only offers a new strategy for fabrication β-CD-based HCPs, but also provided a practical and effective method for efficient isolation and sensitive detection of trace THs residues in complex samples.

中文翻译：

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基于 β-环糊精的磁性超交联聚合物：一种可回收吸附剂，用于在复杂样品基质中有效预浓缩三嗪类除草剂


三嗪类除草剂残留的高效富集和痕量分析对于确保环境和食品安全至关重要。本文用不同的交联剂合成了一系列磁性超交联聚合物 （CD-gs-MHCPs），这些交联剂可能具有不同的孔结构和表面积，因此它们可能会表现出不同的吸附性能。以二氯二甲苯为交联剂的 CD-gs-MHCP2 对三嗪类除草剂 （THs） 具有优异的吸附能力。氢键、疏水相互作用、π-π 堆叠相互作用和孔吸附的协同作用被证明是主要的吸附机制。将基于 CD-gs-MHCP2 的磁性固相萃取 （MSPE） 与高效液相色谱相结合，实现了河水和蔬菜样品（西葫芦、白菜）中 THs 的定量分析。在最佳条件下，三种不同样品的富集因子范围为 94 至 244，四种 TH 的检测限下限 （S/N = 3） 为河水 0.05 至 0.15 ng mL-1，蔬菜样品为 0.31-3.10 ng g-1。方法回收率在 86.2 %–120 % 范围内，相对标准偏差低于 7.4 %。这项工作不仅为制备基于 β-CD 的 HCP 提供了一种新策略，而且为高效分离和灵敏检测复杂样品中的痕量 THs 残留物提供了一种实用有效的方法。