Department of Applied Chemistry, China Agricultural University, Yuanmingyuan West Road 2#, Haidian District, Beijing 100193, China.
Department of Applied Chemistry, China Agricultural University, Yuanmingyuan West Road 2#, Haidian District, Beijing 100193, China.
J Chromatogr A. 2020 May 24;1619:460950. doi: 10.1016/j.chroma.2020.460950. Epub 2020 Feb 5.
It is necessary to establish a rapid, simple and environmentally friendly detection method for benzoylurea pesticides (BUs) in environmental water samples because of their toxicity in environmental circulation. Herein, a novel polyethylene glycol (PEG) modified magnetic covalent organic framework material based on the Schiff base reaction was prepared (PEG/FeO@SNW-1). This material was used as a sorbent for enriching five BUs by magnetic solid phase extraction prior to detection via high-performance liquid chromatography. After the optimization of several parameters (such as the salinity, extraction time, amount of sorbent, desorption time, etc.) that influenced the recovery of the magnetic solid phase extraction process, the limits of detection (S/N = 3) were defined as less than 1.0 μg L, and the limits of quantitation (S/N = 10) were calculated as being lower than 3.4 μg L. A satisfactory linear range of 5-1000 μg L was achieved. Finally, the proposed method was applied to analyze benzoylurea pesticides in three environmental water samples. These results indicated that the proposed method was feasible and demonstrated the potential application of the PEG/FeO@SNW-1 material for detecting similar pesticide residues in environmental water samples.
由于苯甲酰脲类农药（BUs）在环境循环中的毒性，有必要建立一种快速、简单且环保的环境水样中苯甲酰脲类农药的检测方法。本文制备了一种基于希夫碱反应的新型聚乙二醇（PEG）修饰的磁性共价有机骨架材料（PEG/FeO@SNW-1）。该材料被用作磁性固相萃取的吸附剂，用于五种苯甲酰脲类农药的预富集，然后通过高效液相色谱法进行检测。对影响磁性固相萃取过程回收率的几个参数（如盐度、萃取时间、吸附剂用量、解吸时间等）进行优化后，定义检测限（S/N = 3）小于 1.0μg/L，定量限（S/N = 10）计算值低于 3.4μg/L。获得了令人满意的 5-1000μg/L 的线性范围。最后，将所提出的方法应用于三种环境水样中苯甲酰脲类农药的分析。这些结果表明，该方法是可行的，并证明了 PEG/FeO@SNW-1 材料在检测环境水样中类似农药残留方面的潜在应用。
