Institute of Bioengineering, Guangdong Academy of Sciences, Guangzhou 510316, People's Republic of China.
Anal Methods. 2021 Aug 28;13(32):3585-3591. doi: 10.1039/d1ay00867f. Epub 2021 Jul 22.
A rapid and sensitive approach for enriching and extracting triazines from brown sugar samples was developed by combining magnetic dispersive solid-phase extraction and HPLC/UV. In this work, a magnetic porous biochar (MPB) derived from low-cost bagasse was prepared and successfully employed as an adsorbent. A particular emphasis was placed on optimizing the extraction conditions, including the amount of MPB, extraction time, pH, type and volume of eluent, and salt concentration. Under optimized MSPE conditions, the method showed satisfactory linearity over concentration ranges of 2-200 μg L for four triazines, with correlation coefficient values no less than 0.9981. Low limits of detection (0.27-0.33 μg L), good recoveries (81.7-100.7%), and satisfactory repeatability (RSDs ≤ 8.1%) were also demonstrated with respect to the analytical performance. The results demonstrated that the developed method was simple, rapid, sensitive, and efficient, indicating that it could extract and enrich trace triazines from real samples.
建立了一种结合磁性分散固相萃取和高效液相色谱/紫外检测从红糖样品中快速、灵敏地富集和提取三嗪类农药的方法。在这项工作中，制备了一种由廉价甘蔗渣衍生的磁性多孔生物炭（MPB），并成功用作吸附剂。特别强调了优化提取条件，包括 MPB 的用量、提取时间、pH 值、洗脱剂的类型和体积以及盐浓度。在优化的 MSPE 条件下，该方法对四种三嗪类农药在 2-200 μg L 的浓度范围内表现出良好的线性关系，相关系数值不低于 0.9981。该方法具有较低的检测限（0.27-0.33 μg L）、良好的回收率（81.7-100.7%）和令人满意的重复性（RSDs ≤ 8.1%），表明其可从实际样品中提取和富集痕量三嗪类农药。
