Faezeh Khalilian - Department of Chemistry, College of Basic Science, Yadegar -e- Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran
Mohammad Farajvand - Department of Chemistry, College of Basic Science, Yadegar-e-Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran

A solid phase extraction sorbent based on polyaniline/graphene nanocomposite is presented. The structure and morphology of synthesized nanocomposite were investigated by Fourier transform infrared spectroscopy, field emission scanning electron microscopy, X-ray diffraction and thermal gravimetric analysis. The dispersive solid phase extraction was employed to the isolation and preconcentration of avermectins insecticide (mixture of B۱a and B۱b). The extraction procedure was investigated by high performance liquid chromatography-UV detection. The sorbent demonstrated a favorable analytical performance for avermectins detection with reasonable linear ranges (۱.۵-۱۰۰۰ μg L-۱ and ۵.۰-۱۰۰۰ μg L-۱ for B۱a and B۱b in order) and acceptable detection limits (۰.۵ μg L-۱ for B۱a and ۲.۵ μg L-۱ for B۱b) under optimized conditions. The extraction efficiency of polyaniline/graphene nanocomposite in the extraction of avermectins was compared with graphene, polyaniline, carbon nanotube and C۱۸ sorbents. Moreover, the applicability of proposed method was assessed for the extraction of analyte from citrus fruit juice.

Polyanilline/graphene nanocomposite, Dispersive solid phase extraction, Avermectins, High performance liquid chromatography, Citrus fruit juice