Nano Fe-Al-bi-MOF-based dispersive micro solid phase extraction of diazinon, acetochlor, hexaconazole, oxadiazon, fenitrothion, haloxyfop-R-methyl, diniconazole, and tebuconazole from fruit juices

Abstract

This research presents an analytical technique based on nano Fe-Al-bi-MOF designed for the extraction and preconcentration of some pesticides from fruit juices. The MOF was synthesized using iron and aluminum salts along with 1,4-benzenedicarboxylic acid. The obtained sorbent was subjected to a series of characterization techniques to accurately determine the phase and characteristics of the material. The MOF (mg amount) was added in the fruit juices for extracting the targeted pesticides. The mixture was agitated using a vortex mixer to enhance the analytes sorption onto the sorbent, followed by centrifugation to facilitate settling down the analyte-loaded particles. Subsequently, the sorbent particles were subjected to elute with mL-volume of acetonitrile. Ultimately, the resulting eluate was mixed with a µL-volume of 1,2-dibromoethane and rapidly injected into deionized water. The milky solution underwent the process of centrifugation and sedimentation in order to separate the organic phase. An appropriate portion of it was injected into a gas chromatograph equipped with a flame ionization detector. Low limits of detection (0.53–2.59 µg L−1) and quantification (1.75–8.57 µg L−1), high enrichment factors (295−350), appreciable extraction recoveries (59–70 %), and the use of three-dimensional nano MOF in the analytical method development are the highlights of the research.