Abstract Polysulfone magnetic nanoparticles with high adsorption capability have been synthesized through a simple and cost–effective manner for the extraction of some pesticide residues from fruit and vegetable juices. In this method, polysulfone, which is an environmentally–friendly polymer, is coated on an iron magnetic core and used as an adsorbent in magnetic dispersive solid phase extraction. This method is followed by dispersive liquid–liquid microextraction for extra preconcentration of the analytes. Finally, the enriched analytes are analyzed with gas chromatography equipped with flame ionization detector. The presented two–step method is benefited from fast and efficient clean–up of the magnetic dispersive solid phase extraction and high enrichment factor of the microextraction method. Method validation experiments demonstrated that this method has high enrichment factors (230–473) and extraction recoveries (46–95%) and satisfactory linearity (r2 ≥ 0.994) under the optimum conditions. Relative standard deviation is ≤ 5% for intra– (n = 6) and inter–day (n = 5) precisions at three different concentration levels (20, 100, and 250 µg L–1 of each analyte). Moreover, limits of detection and quantification are in the ranges of 0.28–0.54 and 0.96–1.9 µg L−1, respectively.

中文翻译：

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聚砜磁性纳米粒子的合成新工艺及其在磁性固相萃取中的应用，用于从果蔬汁中提取某些农药

摘要 具有高吸附能力的聚砜磁性纳米粒子已通过一种简单且具有成本效益的方式合成，用于提取水果和蔬菜汁中的一些农药残留。在这种方法中，聚砜是一种环境友好的聚合物，它被涂覆在铁磁芯上，用作磁分散固相萃取的吸附剂。该方法之后是分散液-液微萃取，以额外预浓缩分析物。最后，用配备火焰离子化检测器的气相色谱分析富集的分析物。所提出的两步法得益于磁分散固相萃取的快速有效净化和微萃取方法的高富集因子。方法验证实验表明，该方法在最佳条件下具有较高的富集因子 (230–473) 和提取回收率 (46–95%) 以及令人满意的线性 (r2 ≥ 0.994)。在三个不同浓度水平（每种分析物 20、100 和 250 µg L–1）下，日内 (n = 6) 和日间 (n = 5) 精度的相对标准偏差≤ 5%。此外，检测限和定量限分别在 0.28–0.54 和 0.96–1.9 µg L-1 的范围内。