Fig. 4From: Development of dispersive solid-phase microextraction coupled with high-pressure liquid chromatography for the preconcentration and determination of the selected neonicotinoid insecticidesSEM images indicating the external morphologies of PABA/AC (a), Fe3O4@PABA/AC (c) and EDS spectrum of PABA/AC (b) and Fe3O4@PABA/AC (D)Back to article page