Determination of phthalate esters in real matrixes after extraction with a novel magnetic nano-material derived from a metal–organic framework

• Published in: Microchemical journal 2023-08, Vol.191, p.108704, Article 108704
• Main Authors: Heydari, Niloofar, Ghorbani-Kalhor, Ebrahim, Asgharinezhad, Ali Akbar, Bahram, Morteza, Vardini, Mohammad Taghi
• Format: Article
• Language: English
• Subjects: Magnetic porous carbon; Metal-organic framework; Phthalate esters; Polythiophene-polyindole; Preconcentration
• ISSN: 0026-265X; 1095-9149
• DOI: 10.1016/j.microc.2023.108704

Herein, a novel magnetic nano-material derived from a metal–organic framework (MOF) of the type r-MIL-88A composite (MMIL-88A) was fabricated and utilized for extraction of phthalate esters in real matrixes before their determination by gas chromatography. [Display omitted] •A novel magnetic nano-material derived from a metal–organic framework was synthesized.•A polythiophene-polyindole copolymer was utilized to improve the performance.•The nano-material was utilized for the extraction of phthalate esters from real matrixes.•The suggested method has wide linear ranges, low LOD and LOQ, and good precision.•The new method consumes a very low organic solvent volume for the elution process. Herein, a magnetic nano-material derived from a metal–organic framework (MOF) of the type r-MIL-88A composite (MMIL-88A) was fabricated and utilized to extract phthalate esters in real matrixes before their determination by gas chromatography. In this way, the magnetite nanoparticles were coated with r-MIL-88A and then pyrolyzed under the nitrogen atmosphere to convert the MMIL-88A to a magnetic porous carbon (MPC). Finally, the MPC was covered with a polythiophene-polyindole (PTh-PIn) copolymer. The comparison study exhibited that MPC@PTh-PIn has the best extraction performance toward the target analytes compared with MMIL-88A, r-MIL-88A, and MPC. The synthesis of new nanomaterial was proved by FT-IR spectroscopy, XRD, scanning and transition electron microscopies, and vibrating sample magnetometry. The experimental design method was utilized to find the optimum variables. Low detection limits and wide linearity were obtained in the range of 0.06–0.08 µg L−1 and 0.2–100 µg L−1, respectively. The relative recovery and precision (n = 3) were achieved from 6.4% to 8.5%, and from 89% to 104%, respectively. The analytical application of the suggested method was affirmed by the preconcentration/quantification of the phthalate esters in two seawater samples satisfactorily (RSD%, 5–9%; relative recovery, 89–104%). Owing to the ion-exchange properties of PTh-PIn, the MPC@PTh-PIn can be employed for the removal/preconcentration of metal ions and anionic species in future studies.