Magnetic iron(III)‐based framework composites for the magnetic solid‐phase extraction of fungicides from environmental water samples

Abstract

We adopted a facile hydrofluoric acid-free hydro-/solvothermal method for the preparation of four magnetic iron(III)-based framework composites (MIL-101@Fe O -COOH, MIL-101-NH @Fe O -COOH, MIL-53@Fe O -COOH, and MIL-53-NH @Fe O -COOH). The obtained four magnetic iron(III)-based framework composites were applied to magnetic separation and enrichment of the fungicides (prochloraz, myclobutanil, tebuconazole, and iprodione) from environmental samples before high-performance liquid chromatographic analysis. MIL-101-NH @Fe O -COOH showed more remarkable pre-concentration ability for the fungicides as compared to the other three magnetic iron(III)-based framework composites. The extraction parameters affecting enrichment efficiency including extraction time, sample pH, elution time, and the desorption solvent were investigated and optimized. Under the optimized conditions, the standard curve of correlation coefficients were all above 0.991, the limits of detection were 0.04-0.4 μg/L, and the relative standard deviations were below 10.2%. The recoveries of two real water samples ranged from 71.1-99.1% at the low spiking level (30 μg/L). Therefore, the MIL-101-NH @Fe O -COOH composites are attractive for the rapid and efficient extraction of fungicides from environmental water samples.

Magnetic solid‐phase extraction or dispersive liquid–liquid microextraction for pyrethroid determination in environmental samples

“…The preconcentration of pyrethroids in several samples such as water , fruits and vegetables , tea samples , and honey has also been carried out using magnetic solid‐phase extraction (MSPE), a procedure based on the use of magnetic materials which are good adsorbents of organic molecules . The analytes bind to the magnetic nanoparticles (MNPs) and can be separated from the sample by a magnetic field, while the target compounds are then eluted.…”

Metal-Organic Frameworks in Green Analytical Chemistry

“…If we focus on the analytical applications, microextraction techniques using MOFs commonly determine organic pollutants in environmental and food samples [86,88], from drugs in waters [90] to PAHs in foods [96]; and also trace metals in food and water samples [80,83].…”