Saeed Mohammad Sorouraddin

A new extraction procedure was developed by preparing a cylinder gel composed of agarose, glycerol, and a hydrophobic ionic liquid.

In this research, a hybrid sorbent known as QDs@ZIF-8, a composite of zeolitic imidazolate framework-8 and quantum dots, was synthesized and utilized for extracting Ni( ii ) and Co( ii ) ions from water and fruit juice samples.

D-µSPE of heavy metal contaminations in food and beverage products by SiO ₂ @ZIF-8@Fe ₃ O ₄ core–shell nanoparticles.

A micro-solid phase extraction method was developed using a sorbent synthesized from histidine and copper nitrate for the extraction of Zn( ii ) and Cd( ii ) ions from tea samples.

An in-situ CO₂-assisted dispersive micro solid phase extraction was developed using a covalent organic framework synthesized from melamine and barbituric acid as a sorbent for the extraction of Cd(II) and Zn(II) ions from honey samples. The structural and morphological characteristics of the sorbent were evaluated using scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectrometry. The CO₂ generated by reacting tartaric acid and sodium hydrogen carbonate enabled rapid dispersion of the sorbent within the sample solution, ensuring optimal contact with the target ions. After adsorption, the dispersed sorbent particles were separated via centrifugation, followed by elution with diluted nitric acid solution to retrieve the extracted heavy metals from the sorbent surface. The analytes collected in the eluate were quantified via flame atomic absorption spectrometry. Key experimental parameters, including tartaric acid and sodium bicarbonate amounts, sorbent dosage, type and volume of elution solvent, temperature, salt addition, pH, complexing agent concentration, and centrifugation conditions were systematically optimized. The method demonstrated high sensitivity, with the limits of detection of 0.17 and 0.092 µg L^− 1 and broad linear range spanning 0.5–100 and 0.25–100 µg L^− 1 for Cd(II) and Zn(II) ions, respectively. Extraction recoveries of 97.2 and 95.5%, with relative standard deviations of 3.6 and 2.7% for Cd(II) and Zn(II) ions, respectively, were obtained. Validation using a certified reference material confirmed the method’s accuracy, and application of the method on honey samples demonstrated its practicality.

This study introduces an in situ sorbent formation dispersive solid-phase extraction method for the simultaneous extraction and determination of seven metal ions (V, Cr, Ni, Cu, Zn, Cd, and Pb).

In the present research, an attempt has been made to develop a new thin film microextraction method for the extraction of several polycyclic aromatic hydrocarbons from aqueous samples collected from different industrial units prior to their analysis by gas chromatography combined with a flame ionization detector. In this approach, a thin iron mesh was modified by the formation of iron(II) oxinate on its surface and used for the extraction of analytes without an additional sorbent. For this purpose, first, the mesh was immersed in a sulfuric acid solution and then transferred into an 8-hydroxy quinoline (oxine) solution dissolved in ammonia solution. By doing so, iron(II) oxinate was formed on the surface of the mesh and enhanced its adsorption efficiency towards the analytes. It is worth noting that the unique structure of the prepared mesh provided a large contact area and high affinity for adsorption of the analytes. After desorption of the analytes from the sorbent surface with an elution solvent, the analytes were more concentrated by performing dispersive liquid–liquid microextraction. Under optimum conditions, the method demonstrated limits of detection and quantification within the ranges of 0.27–54 and 0.89–1.7 ng mL⁻¹, respectively. The relative standard deviation values for intra- and inter-day precisions ranged from 5.2–8.1% and 8.2–11.6%, respectively. Furthermore, the enrichment factors for the target analytes varied between 200 and 255, while the extraction recoveries fell within the range of 40–51%. These findings illustrate the sensitivity, precision, and effectiveness of the method for quantifying the desired analytes.