Preparation of porous zinc ferrite/carbon as a magnetic-assisted dispersive miniaturized solid phase extraction sorbent and its application.

In this study, porous ZnFe2O4/carbon, derived from Zn-Fe zeolitic imidazolate framework (Zn-Fe-ZIF), was employed as a novel sorbent for magnetic-assisted dispersive miniaturized solid phase extraction (M-DμSPE). The Zn-Fe-ZIF derived magnetic porous ZnFe2O4/carbon was easily prepared using a one-pot solvothermal method, and its morphology, structure and magnetic characteristics were evaluated via scanning electron microscopy, powder X-ray diffraction, Raman spectroscopy and vibrating sample magnetometry. The extraction ability of ZnFe2O4/carbon is evaluated by different kinds of compounds including organochlorine pesticides, pyrethroid insecticides, aldehydes, nerolidol, benzoic acid and sorbic acid. A M-DμSPE method was developed for the analysis of organochlorine pesticides. Several parameters affecting the extraction efficiency were systematically investigated. The calibration curves ranged from 0.05 to 100 ng g-1 and the limits of detection were 0.005-0.3 ng g-1. The intra-day and inter-day relative standard deviations were lower than 2.3 and 5.2%. The recoveries of spiked organochlorine pesticides were in the range of 86.1-109.4%.