Determination of mercury(II) ions in seafood samples after extraction and preconcentration by a novel functionalized magnetic metal–organic framework nanocomposite

Abstract

This work describes a novel functionalized magnetic metal-organic framework nanocomposite [(Fe3O4-2,5-dimercapto-1,3,4-thiadiazole)/metal-organic framework] and its application in the preconcentration of Hg(II) ions. The parameters affecting the preconcentration procedure were optimized by a Box-Behnken design through response surface methodology. Three variables (uptake time, magnetic nanosorbent amount, and pH value) were selected as the main factors affecting the sorption step, while four variables (type, volume, and concentration of the eluent; and elution time) were selected as main factors in the optimization study of the elution step. Following the sorption and elution of analytes, the ions were quantified by cold vapor atomic absorption spectrometry. Under the optimum conditions, the limit of detection was 0.01 ng/mL and all the relative standard deviations were less than 10%. The obtained sorption capacity (in mg/g) of this new sorbent was 124. Ultimately, this nanocomposite was successfully applied to the rapid extraction of trace quantities of Hg(II) ions in seafood samples and satisfactory results were obtained.

Solid‐phase extraction using octadecyl‐bonded silica modified with photosynthetic pigments from Spinacia oleracea L. for the preconcentration of lead(II) ions from aqueous samples

“…In turn, pyridine‐functionalized CNs were applied for the preconcentration of copper(II) . Other work describes the application of a novel functionalized magnetic metal–organic framework nanocomposite [(Fe 3 O 4 –2,5‐dimercapto‐1,3,4‐thiadiazole)/metal–organic framework] for the preconcentration of Hg(II) ions . An interesting approach to metal ions isolation represents works describing the synthesis of novel molecularly imprinted copolymer gel microbeads with the aim to copper(II) SPE .…”

Synthesis of Magnetic Metal-Organic Frame Material and Its Application in Food Sample Preparation

“…The composite of MMOFs is simple to prepare, stable in structure and function, and can replace the traditional adsorbent to achieve more efficient and faster detection [176,177]. As a result, various MMOFs were synthesized and applied in the extraction of Hg 2+ [178][179][180], Sn 2+ [181], Cr 3+ [182], Pb 2+ [183] from food samples. Figure 11a has illustrated the fabrication of novel MOFs meso-porous nFe 3 O 4 @MIL-88A(Fe)/3-aminopropyltrimethoxysilane (APTMS) nanocomposite, which exhibited excellent selective adsorption performance for heavy metal ions [184].…”

Eco‐friendly synthesis of 3,4‐dihydroquinoxalin‐2‐amine, diazepine‐tetrazole and benzodiazepine‐2‐carboxamide derivatives with the aid of MCM‐48/H5PW10V2O40

“…Heterogeneous catalytic systems have attracted worldwide attention and have been studied extensively due to their technological and biological applications such as in drug delivery, bioseparation, biomolecular sensors and magnetic resonance imaging …”