Synthesis of polyaniline-magnetite hollow nanocomposite as a novel fiber coating for the headspace solid-phase microextraction of benzene, toluene, ethylbenzene and xylenes from water samples

Abstract

In this study, the polyaniline–magnetite (PA@Fe₃O₄) hollow nanocomposite was synthesized by a chemical polymerization technique, and magnetite nanoparticles were deposited on the polyaniline hollow shell. The synthesized PA@Fe₃O₄ was successfully prepared and immobilized on a stainless steel wire and used as a novel fiber coating for headspace solid-phase microextraction. The fiber was evaluated for the extraction of benzene, toluene, ethylbenzene and xylenes (BTEX) from water samples. The analytical merits of the method under optimum conditions (extraction temperature: 50 °C, extraction time: 12 min, desorption temperature: 250 °C, desorption time: 1 min, salt concentration: 0.5 g mL⁻¹) are 0.58–2.9 ng L⁻¹ and 0.01–500 μg L⁻¹ for LOD and LDR, respectively. Under optimum conditions, the repeatability for one fiber (n = 3), expressed as the relative standard deviation (RSD%), was between 4.1% and 7.5% for the BTEX.