MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, China.
Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, China.
Anal Chim Acta. 2022 Jul 25;1218:339982. doi: 10.1016/j.aca.2022.339982. Epub 2022 Jun 1.
Herein, a novel solid-phase microextraction (SPME) fiber based on the NU-1000 sorbent was developed for direct immersion extraction of organochlorine pesticides (OCPs) in water samples. As a kind of metal-organic framework, the NU-1000 possessed the mesoporous channels which were beneficial for the mass transfer of target analytes. Extraction equilibrium was achieved rapidly with the optimal extraction time of 30 min. The NU-1000 coated fiber with a high specific surface area showed better extraction efficiencies than commercial fibers (65 μm PDMS/DVB or 85 μm PA) towards OCPs, with the enrichment factors of the NU-1000 coated fiber 2-20 times higher than the latter. NU-1000 coated fiber showed higher extraction efficiencies toward polycyclic aromatic hydrocarbons (PAHs) than OCPs and nitrobenzenes. This indicated that π-π interaction and CH-π interaction between pollutants and aromatic groups of the NU-1000 contributed to the high extraction efficiencies. Under the optimal conditions (extraction at 40 °C for 30 min and desorption at 260 °C for 6 min), the NU-1000 coated fiber coupled with gas chromatography-mass spectrometry (GC-MS) exhibited satisfied analytical performance on analysis of OCPs, with a wide linear range (0.1-2000 ng L), low limits of detections (LODs, 0.011-0.058 ng L), and good reproducibility and repeatability. The established method has been successfully applied to the determination of OCPs in surface water with good sensitivity and recoveries, which proved the great promise of the NU-1000 on the extraction of organic pollutants with conjugated groups.
在此，开发了一种基于 NU-1000 吸附剂的新型固相微萃取（SPME）纤维，用于直接浸入式水样中有机氯农药（OCPs）的萃取。作为一种金属有机骨架，NU-1000 具有有利于目标分析物传质的中孔通道。在最佳萃取时间为 30 分钟时，萃取达到平衡。具有高比表面积的 NU-1000 涂层纤维对 OCPs 的萃取效率优于商用纤维（65μm PDMS/DVB 或 85μm PA），NU-1000 涂层纤维的富集因子比后者高 2-20 倍。与 OCPs 和硝基苯相比，NU-1000 涂层纤维对多环芳烃（PAHs）具有更高的萃取效率。这表明污染物与 NU-1000 芳香基团之间的π-π相互作用和 CH-π相互作用有助于高萃取效率。在最佳条件下（40°C 萃取 30 分钟，260°C 解吸 6 分钟），与气相色谱-质谱联用（GC-MS）联用的 NU-1000 涂层纤维对 OCPs 的分析表现出令人满意的分析性能，具有较宽的线性范围（0.1-2000ngL）、较低的检出限（LODs，0.011-0.058ngL）以及良好的重现性和重复性。该方法已成功应用于地表水 OCPs 的测定，具有较高的灵敏度和回收率，证明了 NU-1000 在萃取具有共轭基团的有机污染物方面具有广阔的应用前景。
