Carbon nanotubes/poly-ortho-aminophenol composite as a new coating for the headspace solid-phase microextraction of polycyclic aromatic hydrocarbons
In this work, oxidized multiwalled carbon nanotubes/poly-ortho-aminophenol (MWCNTs/PoAP) composite was directly electrodeposited on the surface of a stainless steel wire as a new coating. It was applied to the headspace solid-phase microextraction (HS-SPME) of a group of polycyclic aromatic hydrocarbons (PAHs) and biphenyl from aqueous samples and determination by gas chromatography with mass spectrometry (GC-MS). The characteristics of the fiber coating were studied by scanning electron microscopy and Fourier transform infrared spectroscopy. To evaluate the coating, the influence of various parameters on PAHs and biphenyl extraction efficiency by HS-SPME was investigated. At the optimum conditions, the linearity of the method based on the MWCNTs/PoAP fiber were 0.05–20 ng mL−1 for naphthalene and pyrene and 0.01–20 ng mL−1 for other PAHs. In addition, the limits of detection (LODs) (S/N = 3) were 0.002–0.01 ng mL−1. The intra-day and inter-day relative standard deviations at 0.5 ng mL−1 concentration level (n = 5) using a single-fiber were from 4.7% to 9.3% and 6.4% to 10.1%, respectively. The fiber-to-fiber RSD% (n = 3) was between 7.1% and 12.5%. Finally, the development method was applied to the analysis of real samples.