A fast and simple dispersive solid phase extraction method is described for nitrophenols determination in water samples by using gas chromatography-nitrogen phosphorous detector. Firstly, the Poly(amidoamine) grafted Fe₃O₄ magnetic nanoparticles were synthesized in different generations by successive addition of butyl acrylate and ethylenediamine. After characterization, the prepared dendrimer was utilized as an adsorbent for magnetic solid phase extraction of 2-nitrophenol, 3-nitrophenol, and 4-nitrophenol to benefit large number of surface amine interaction sites. The effects of the different parameters influencing the sample preparation efficiency were investigated. The proposed method showed linearity in the ranges of 0.04–700 and 0.05–700 µg/dm³ for nitrophenols. The obtained limits of detection and quantification under optimized conditions were 0.01–0.02 and 0.04–0.05 µg/dm³, respectively. The relative standard deviations (n = 5) were less than 3.8% (at 10 µg/dm³). Moreover, the calculated enrichment factors were above 200. In addition, the relative recoveries for a spiked river water sample were satisfactory.

介绍了一种快速、简便的分散固相萃取气相色谱-氮磷检测器测定水样中硝基苯酚的方法。首先，通过相继添加丙烯酸丁酯和乙二胺，合成了不同代的聚酰胺胺接枝Fe ₃ O ₄磁性纳米粒子。经过表征后，制备的树枝状聚合物用作磁性固相萃取2-硝基苯酚、3-硝基苯酚和4-硝基苯酚的吸附剂，有利于大量的表面胺相互作用位点。研究了不同参数对样品制备效率的影响。对于硝基酚，所提出的方法显示出 0.04–700 和 0.05–700 µg/dm ³范围内的线性。在优化条件下获得的检测限和定量限分别为0.01-0.02和0.04-0.05 µg/dm ³。相对标准偏差 ( n  = 5) 小于 3.8%（10 µg/dm ³时）。此外，计算出的富集因子超过 200。此外，加标河水样品的相对回收率令人满意。