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A novel modified magnetic Co-MOF-71 for magnetic solid phase extraction of Hg(II) ions in food samples

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Abstract

Herein, a novel functionalized magnetic metal–organic framework (MOF) was synthesized and utilized for the extraction and determination of Hg(II) ions in food samples. This is the first report on the modification of magnetite@Co-MOF-71 with 1,3,4-Thiadiazole-2,5-dithiol chelator and its application for the separation/enrichment of Hg(II) ions in food samples. The synthesis of new material was confirmed by performing SEM, TEM, VSM, and FT-IR tests. An experimental design approach was employed to optimize the extraction conditions. In this way, the following condition provided the highest uptake percentage: pH of the sample, 5.0; uptake time, 9.0 min; adsorbent dosage, 18 mg. For the elution step, the best condition was obtained by utilizing 0.7 mol L−1 HCl solution (0.8 mL) as an eluent for 11 min. Determination of mercury was performed on a cold vapor atomic absorption spectrometer. The LOD, LOQ, and linear dynamic range for the proposed extraction method were 0.004 μg L−1, 0.01 μg L−1, and 0.01–40 μg L−1, respectively. The repeatability of the new method at three concentration of 0.01, 2.0, 40 μg L−1 (n = 3) was 13.0%, 10.5%, and 7.3%, respectively. In the end, the new method was employed for the determination of ultra-trace amounts of Hg(II) ions in food samples, and satisfactory results were achieved (Recovery, 85–110%; RSD%, 4.7–11.8%).

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AZ contributed to conceptualization, methodology, data curation, writing-original draft preparation, visualization, and investigation. HRG contributed to supervision, software, investigation, writing—reviewing and editing. MKK contributed to conceptualization, methodology, validation, writing—reviewing and editing NK contributed to conceptualization, methodology, investigation, writing—reviewing and editing.

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Correspondence to Hamid Reza Ghasempour.

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Zanganeh, A., Ghasempour, H.R., Koohi, M.K. et al. A novel modified magnetic Co-MOF-71 for magnetic solid phase extraction of Hg(II) ions in food samples. Res Chem Intermed 49, 2123–2140 (2023). https://doi.org/10.1007/s11164-023-04976-x

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