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合成Fe3O4/Au复合磁性纳米基底,实现了对水中多环芳烃(PAHs)的测定。利用高分辨率透射电子显微镜和振动样品磁强计对所合成的Fe3O4/Au复合磁性纳米基底进行表征。结果表明:合成的复合基底为Fe3O4纳米颗粒与Au纳米颗粒交错结合在一起形成的复合物;复合基底对外加磁场具有较强的磁响应,使得基底非常易于从被测物基质中快速分离;根据对于水中5种代表性PAHs的检测结果,方法检测限为0.50~0.05μmol/L,并对实际河水样品的混合加标测定取得了理想的效果,各PAHs的特征峰可以明显地识别出来。研究合成的SERS基底结合便携式拉曼光谱仪,有望拓展SERS技术在复杂基质中多环芳烃快速检测领域的应用。
Synthesis Fe3O4 / Au composite magnetic nano-substrate, to achieve the determination of polycyclic aromatic hydrocarbons (PAHs) in water. The synthesized Fe3O4 / Au composite magnetic nano-substrates were characterized by high resolution transmission electron microscopy and vibrating sample magnetometer. The results show that the composite substrate is composed of Fe3O4 nano-particles and Au nano-particles interlaced together. The composite substrate has a strong magnetic response to the applied magnetic field, so that the substrate can be quickly separated from the substrate under test. According to The detection limits of five representative PAHs in water were 0.50 ~ 0.05μmol / L. The mixed spiked water samples obtained by the real river water samples obtained the ideal results. The characteristic peaks of each PAHs were clearly identified. The synthesis of SERS substrate combined with portable Raman spectrometer is expected to expand the application of SERS technology in the rapid detection of polycyclic aromatic hydrocarbons in complex matrix.