Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Vegetables Quality and Safety Control, Ministry of Agriculture and Rural Affairs of China, Beijing, 100081, China.
Department of Applied Chemistry, China Agricultural University, Beijing, 100193, China.
Sci Rep. 2019 Jun 20;9(1):8919. doi: 10.1038/s41598-019-45186-z.
A magnetic graphene/polydopamine (MG/PDA) nanocomposite has been prepared and used as sorbent for magnetic dispersive solid-phase extraction (MDSPE) of four benzoylurea insecticides in environmental water samples. The obtained nanocomposites were characterized by transmission electron microscopy, scanning electron microscopy, vibrating sample magnetometry, powder X-ray diffraction, fourier transform infrared spectroscopy, surface area and porosity analysis and thermogravimetric analysis. To investigate the adsorption performance of MG/PDA for target analytes, various parameters affecting the MG/PDA-based MDSPE procedure were optimized. Under the optimal conditions, the established method exhibits good linearity (R ≥ 0.9988) in the concentration range 2.5-500 µg L. A low limit of detection (0.75 µg L, signal/noise = 3:1), a low limit of quantification (2.50 µg L, signal/noise = 10:1), and good precision (intraday relative standard deviation ≤3.6%, interday relative standard deviation ≤4.5%) are also achieved. Finally, the simple, fast, and sensitive sample preparation technique was successfully used to determine benzoylurea insecticides in environmental water samples.
一种磁性石墨烯/聚多巴胺（MG/PDA）纳米复合材料已被制备并用作环境水样中四种苯甲酰脲类杀虫剂的磁性分散固相萃取（MDSPE）的吸附剂。所得到的纳米复合材料通过透射电子显微镜、扫描电子显微镜、振动样品磁强计、粉末 X 射线衍射、傅里叶变换红外光谱、比表面积和孔隙率分析以及热重分析进行了表征。为了研究 MG/PDA 对目标分析物的吸附性能，优化了影响基于 MG/PDA 的 MDSPE 过程的各种参数。在最佳条件下，所建立的方法在 2.5-500 µg/L 的浓度范围内表现出良好的线性（R≥0.9988）。检测限低（0.75 µg/L，信噪比=3:1），定量限低（2.50 µg/L，信噪比=10:1），精密度良好（日内相对标准偏差≤3.6%，日间相对标准偏差≤4.5%）。最后，该简单、快速、灵敏的样品制备技术成功地用于测定环境水样中的苯甲酰脲类杀虫剂。
