Department of Chemistry, College of Science, Hebei Agricultural University, Baoding, 071001, Hebei, China.
Mikrochim Acta. 2018 Nov 20;185(12):554. doi: 10.1007/s00604-018-3085-y.
Magnetic knitting aromatic polymers (FeO/KAPs) are introduced here as a new kind of sorbents. KAPs are hyper-cross-linked-polymers that were prepared via a Friedl-Crafts reaction from triphenylphosphine and benzene as building blocks. The FeO/KAP composite was obtained by coprecipitation of KAP with magnetite nanoparticles. The resulting FeO/KAP is shown to be a viable magnetic sorbent for various organic materials such as the phenylurea herbicides (PUHs), including metoxuron, monuron, chlortoluron, monolinuron and buturon, and also for various phthalates, polycyclic aromatic hydrocarbons and chlorophenols. The FeO/KAP was characterized by means of Brunauer-Emmett-Teller surface area measurements, Fourier-transform infrared spectroscopy, thermogravimetry, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Following desorption with acetonitrile, the analytes were quantified by using HPLC with UV detection. The effects of adsorbent dosage, extraction time, sample pH, ionic strength, desorption solvent and desorption time were optimized for the PUHs. Under optimal conditions, response is linear from 0.5-1.0 up to 50 ng·mL for the five PUHs. Lower limits of detection range between 0.05 and 0.30 ng·mL. Other figures of merit include (a) high enrichment factors (60-297), (b) good recoveries (91.8-106.5%), and (c) relative standard deviations of <8.4%. The method was successfully applied to analysis of the PUHs in real samples (bottled mixed juice, milk and soymilk). The results indicate that such FeO/KAPs have a wide application scope as an adsorbent for use in magnetic solid phase extraction. Graphical abstract A magnetic knitting aromatic polymer based nanocomposite (FeO/KAP) was prepared by a one-pot method and explored as an absorbent for magnetic solid-phase extraction (MSPE) of phenylurea herbicides (PUHs) from bottled mixed juice, milk and soymilk samples before quantitation by HPLC with UV detection.
磁性编织芳香聚合物（FeO/KAPs）作为一种新型吸附剂被引入。KAPs 是一种超交联聚合物，由三苯基膦和苯作为构建块通过 Friedl-Crafts 反应制备而成。FeO/KAP 复合材料是通过磁铁矿纳米粒子与 KAP 共沉淀得到的。结果表明，FeO/KAP 是一种可行的磁性吸附剂，可用于各种有机材料，如苯脲类除草剂（PUHs），包括甲氧隆、单隆、绿隆、利谷隆和丁隆，以及各种邻苯二甲酸酯、多环芳烃和氯酚。通过比表面积测量、傅里叶变换红外光谱、热重分析、X 射线衍射、扫描电子显微镜和透射电子显微镜对 FeO/KAP 进行了表征。用乙腈解吸后，用 HPLC-UV 检测定量分析分析物。优化了吸附剂用量、萃取时间、样品 pH 值、离子强度、解吸溶剂和解吸时间对 PUHs 的影响。在最佳条件下，五种 PUHs 的响应线性范围为 0.5-1.0，直至 50ng·mL。检测下限范围在 0.05 和 0.30ng·mL 之间。其他优点包括（a）高富集因子（60-297），（b）良好的回收率（91.8-106.5%），和（c）相对标准偏差小于 8.4%。该方法成功应用于实际样品（瓶装混合果汁、牛奶和豆浆）中 PUHs 的分析。结果表明，FeO/KAPs 作为一种用于磁性固相萃取的吸附剂具有广泛的应用范围。
