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One-step fabrication of alkali–acid modified three-dimensional magnetic biochar for the determination of pesticides in pigment-rich vegetables
Analytical Methods ( IF 2.7 ) Pub Date : 2020-12-23 , DOI: 10.1039/d0ay02063j Shurui Cao 1, 2, 3, 4 , Yuantao Zhou 4, 5, 6, 7 , Cunxian Xi 4, 8, 9 , Xianliang Li 4, 8, 9 , Lei Zhang 4, 8, 9 , Zhiqiong Chen 4, 5, 6, 7
Analytical Methods ( IF 2.7 ) Pub Date : 2020-12-23 , DOI: 10.1039/d0ay02063j Shurui Cao 1, 2, 3, 4 , Yuantao Zhou 4, 5, 6, 7 , Cunxian Xi 4, 8, 9 , Xianliang Li 4, 8, 9 , Lei Zhang 4, 8, 9 , Zhiqiong Chen 4, 5, 6, 7
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Magnetic biochar was successfully synthesized via a one-step method through simultaneous activation and magnetization with alkali–acid modified citrus peel as the raw material, which could effectively penetrate interfering substances. The characterization analysis showed that the magnetic biochar exhibited high graphitic degree, higher specific surface area and smaller pore diameter, which resulted in superior adsorption performance. The magnetic biochar was used as an adsorbent for the cleanup and extraction of 22 pesticides (consisting of insecticides, fungicides and herbicides) from vegetables and the quantitative detection was completed by gas chromatography-mass spectrometry (GC-MS). The Plackett–Burman experimental design (PBD), central composite design (CCD) and response surface methodology (RSM) were employed to identify significant factors and optimal experimental conditions. Under optimal conditions, the methodological linearity was in the range of 1–100 μg kg−1 with the coefficients of determination ranging from 0.9969–0.9999, while the limits of detection (LODs) and limits of quantification (LOQs) were 0.31–0.91 μg kg−1 and 1.03–3.05 μg kg−1, respectively. The recoveries of the analytes from spiked samples were in the range of 78.1–112.5%. It was confirmed that the method established by using magnetic graphitic biochar as the adsorbent is an efficient pretreatment procedure and could be successfully applied for analysis of food safety.
中文翻译：
一步法制备碱-酸修饰的三维磁性生物炭，用于测定富含色素的蔬菜中的农药
磁性生物炭成功地通过一种通过碱金属改性的柑橘皮为原料同时活化和磁化的一步法，可以有效地渗透干扰物质。表征分析表明，该磁性生物炭具有较高的石墨化度，较高的比表面积和较小的孔径，具有优异的吸附性能。磁性生物炭被用作吸附剂，用于从蔬菜中纯化和提取22种农药（包括杀虫剂，杀真菌剂和除草剂），并通过气相色谱-质谱（GC-MS）进行定量检测。采用Plackett-Burman实验设计（PBD），中央复合设计（CCD）和响应面方法（RSM）来确定重要因素和最佳实验条件。-1的测定系数范围为0.9969-0.9999，而检出限（LOD）和定量限（LOQ）分别为0.31-0.91μgkg -1和1.03-3.05μgkg -1。从加标样品中分析物的回收率在78.1–112.5％之间。证实了使用磁性石墨生物炭作为吸附剂建立的方法是一种有效的预处理程序，可以成功地用于食品安全性分析。
更新日期：2021-01-14
中文翻译：
一步法制备碱-酸修饰的三维磁性生物炭，用于测定富含色素的蔬菜中的农药
磁性生物炭成功地通过一种通过碱金属改性的柑橘皮为原料同时活化和磁化的一步法，可以有效地渗透干扰物质。表征分析表明，该磁性生物炭具有较高的石墨化度，较高的比表面积和较小的孔径，具有优异的吸附性能。磁性生物炭被用作吸附剂，用于从蔬菜中纯化和提取22种农药（包括杀虫剂，杀真菌剂和除草剂），并通过气相色谱-质谱（GC-MS）进行定量检测。采用Plackett-Burman实验设计（PBD），中央复合设计（CCD）和响应面方法（RSM）来确定重要因素和最佳实验条件。-1的测定系数范围为0.9969-0.9999，而检出限（LOD）和定量限（LOQ）分别为0.31-0.91μgkg -1和1.03-3.05μgkg -1。从加标样品中分析物的回收率在78.1–112.5％之间。证实了使用磁性石墨生物炭作为吸附剂建立的方法是一种有效的预处理程序，可以成功地用于食品安全性分析。
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