Wang Xuemei, Chen Jun, Liu Jingwei, Zhang Jie, Du Xinzhen, Lu Xiaoquan
Key Laboratory of Water Security and Water Environment Protection in Plateau Intersection, Ministry of Education, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, PR China; Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, Lanzhou, 730070, PR China.
Key Laboratory of Water Security and Water Environment Protection in Plateau Intersection, Ministry of Education, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, PR China.
Talanta. 2025 Jan 1;281:126812. doi: 10.1016/j.talanta.2024.126812. Epub 2024 Sep 5.
Because of rapid industrialization and agriculturalization, solving the pressing problems of environment pollution, especially water and food quality, requires innovative solutions. In this paper, a novel and versatile metal-organic framework (ZIF-8)-hybrid monolithic column (ZIF-HMC) was prepared for in-tube solid-phase microextraction (IT-SPME) of organic nitrogen pesticides (ONPs). The prepared monolithic columns had superior adsorption sites, high porosity, excellent permeability, and ideal specific surface area based on Fourier Transform Infrared Spectroscopy (FT-IR), X-ray Diffraction (XRD), Thermal Field Emission Scanning Electron Microscopy (SEM), Energy Dispersive Spectrometry (EDS), X-ray Photoelectron Spectroscopy (XPS), and N adsorption-desorption. The ZIF-HMC contained a large number of nitrogen and oxygen atoms, benzene rings and ZIF-8, which could synergistically promote the adsorption efficiency of ONPs through multiple interactions, such as hydrogen bonding, π-π accumulation, hydrophobic interactions, cation-π interactions, and pore adsorption by MOFs. Under the optimal conditions, a simple, efficient, and sensitive method for the analysis of six organic pesticides in environmental water samples was developed by using the ZIF-HMC as the extraction medium coupled with high performance liquid chromatography-ultraviolet (HPLC-UV). The method had a wide linear range (0.63-1000 μg L), a low detection limit (0.19-1.91 μg L) and satisfactory recoveries (87.4 %-110.2 %), the linear correlation coefficient was (R) 0.9972-0.9995 and the relative standard deviation (RSD) was less than 2.64 %. The study had demonstrated the potential application of the developed method for the enrichment and analysis of organic pesticides in complex matrices of environmental samples, as well as the feasibility of MOFs materials for IT-SPME sample preparation.
由于快速的工业化和农业化，解决环境污染的紧迫问题，特别是水和食品质量问题，需要创新的解决方案。本文制备了一种新型多功能金属有机框架（ZIF-8）杂化整体柱（ZIF-HMC），用于有机氮农药（ONPs）的管内固相微萃取（IT-SPME）。基于傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）、热场发射扫描电子显微镜（SEM）、能谱分析（EDS）、X射线光电子能谱（XPS）和N吸附-脱附，制备的整体柱具有优异的吸附位点、高孔隙率、良好的渗透性和理想的比表面积。ZIF-HMC含有大量的氮和氧原子、苯环和ZIF-8，它们可以通过氢键、π-π堆积、疏水相互作用、阳离子-π相互作用和MOF的孔隙吸附等多种相互作用协同提高ONPs的吸附效率。在最佳条件下，以ZIF-HMC为萃取介质，结合高效液相色谱-紫外检测（HPLC-UV），建立了一种简单、高效、灵敏的环境水样中6种有机农药的分析方法。该方法线性范围宽（0.63-1000 μg L）、检测限低（0.19-1.91 μg L）、回收率良好（87.4%-110.2%），线性相关系数（R）为0.9972-0.9995，相对标准偏差（RSD）小于2.64%。该研究证明了所建立方法在复杂环境样品基质中有机农药富集分析方面的潜在应用，以及MOF材料用于IT-SPME样品制备的可行性。
