Ghani Milad, Font Picó Maria Francesca, Salehinia Shima, Palomino Cabello Carlos, Maya Fernando, Berlier Gloria, Saraji Mohammad, Cerdà Víctor, Turnes Palomino Gemma
Department of Chemistry, University of the Balearic Islands, Palma de Mallorca, E-07122, Spain; Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran.
Department of Chemistry, University of the Balearic Islands, Palma de Mallorca, E-07122, Spain.
J Chromatogr A. 2017 Mar 10;1488:1-9. doi: 10.1016/j.chroma.2017.01.069. Epub 2017 Jan 29.
We present for the first time the application of metal-organic framework (MOF) mixed-matrix disks (MMD) for the automated flow-through solid-phase extraction (SPE) of environmental pollutants. Zirconium terephthalate UiO-66 and UiO-66-NH MOFs with different size (90, 200 and 300nm) have been incorporated into mechanically stable polyvinylidene difluoride (PVDF) disks. The performance of the MOF-MMDs for automated SPE of seven substituted phenols prior to HPLC analysis has been evaluated using the sequential injection analysis technique. MOF-MMDs enabled the simultaneous extraction of phenols with the concomitant size exclusion of molecules of larger size. The best extraction performance was obtained using a MOF-MMD containing 90nm UiO-66-NH crystals. Using the selected MOF-MMD, detection limits ranging from 0.1 to 0.2μgL were obtained. Relative standard deviations ranged from 3.9 to 5.3% intra-day, and 4.7-5.7% inter-day. Membrane batch-to-batch reproducibility was from 5.2 to 6.4%. Three different groundwater samples were analyzed with the proposed method using MOF-MMDs, obtaining recoveries ranging from 90 to 98% for all tested analytes.
