Headspace solid-phase microextraction of organophosphorus pesticides based on a Ni-MOF/ polyacrylonitrile electrospun nanofiber as an efficient nanosorbent followed by CD-IMS analysis
Paper ID : 1555-ICNS
Shima Amini *1, Homeira Ebrahimzadeh1, shahram seidi2, Niloofar Jalilian1
1Faculty of Chemistry and Petroleum Sciences, Shahid Beheshti University, G.C., Evin, Tehran, Iran
2Faculty of Science, Khaje Nasir Toosi University of Technology, Tehran, Iran
A nickel-based metal-organic framework/polyacrylonitrile nanocomposite (Ni-MOF/PAN) coating on a stainless steel wire was successfully synthesized by electrospinning method. The resulting nanocomposite was employed as a sorbent for headspace solid-phase microextraction of organophosphorous pesticides (OPPs), diazinon (DIZ) and chlorphyrifos (CPS) from aqueous media followed by corona discharge ion mobility spectrometry (CD-IMS). The Ni-MOF/PAN nanofibers coating was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX) and elemental mapping techniques. The scanning electron microscopy (SEM) images of this coating exhibited a diameter range of 145–280 nm for nanofibers with a homogeneous and porous surface structure. The experimental parameters affecting SPME procedure including extraction temperature, extraction time, salt addition, pH, stirring rate and desorption temperature were optimized. Under optimized conditions, the detection limit based on a signal-to-noise ratio of 3 (S/N=3) was calculated to be 0.3 and 0.2 ng mL−1 for diazinon and chlorpyrifos respectively. The intra-day relative standard deviations (RSD) (n =5) at the concentration levels of 20, 40 and 100 ng mL−1 were ≤ 5.2 %. The calibration curves of diazinon and chlorpyrifos exposed linearity in the range of 0.5 - 300 ng mL−1.
Electrospinning; Nanofibers; Solid phase microextraction; Ion mobility spectrometry; organophosphorous pesticides.
Status : Abstract Accepted (Poster Presentation)