Trace amounts of Cu (II), Pb (II), and Cd (II) in a wastewater sample were preconcentrated with a novel cross‐linked magnetic chitosan modified with a new synthesised methionine‐glutaraldehyde Schiff's base (MG‐Chi/Fe3O4) as a dispersive solid‐phase extraction (DSPE) adsorbent. The adsorbed metal ions were then eluted with a specific volume of suitable solution and determined by flame atomic absorption spectrometry (FAAS). Various parameters affecting the extraction efficiency of the metal ions were investigated and optimised, including pH, amount of adsorbent, extraction time, type and volume rate of eluent, elution time, sample volume, and effect of interfering ions. The adsorption kinetics are more consistent with the pseudo‐second order model. The results were statistically interpreted and the analytical performance of the proposed method was found to have preconcentration factors of 55, 60, and 50 μg L−1 for Cu(II), Pb(II), and Cd(II), respectively, limits of detection were 0.22, 0.24, and 0.10 μg L−1 for Cu(II), Pb(II), and Cd(II), respectively, with a relative standard deviation (1.5%‐2.8 %), and the liner range was 5–1000 for Cu(II) and Pb(II) and 2.5–1000 for Cd(II). It was concluded that this method was suitable for successful simultaneous determination of Cu(II), Pb(II), and Cd(II) in industrial wastewater samples.
The effluent release containing heavy metals as Ni2+ ions has drastic risks to both the natural environment and human health. In this research, the nano Fe3O4/chitosan-acrylamide hydrogel was prepared as a novel nano sorbent for dispersive solid-phase extraction of Ni2+ ions and applyed in for the water sample solution. The pH, amount and type of elution solvent, the extraction time and etc were optimized for the improving the efficiency of proposed method. Analytical parameters such as concentration factor, the limit of detection and relative standard deviation (%) were achieved as 33.3, 1.25 µg L− 1 and 1.8%, respectively. The capacity in equilibrium sorption was calculated 22.54 mg g− 1. Furthermore, to estimate adsorption mode, the model of Freundlich and Langmuir was fitted to empirical isotherm data. Besides, to check the basic process of the metal adsorption mechanism pseudo-first-order and pseudo-second-order and Roginsky-Zeldovich model were investigated and the resuls were fitted with the pseudo-second-order model. Finally, the nano Fe3O4/chitosan-acrylamide hydrogel exhibited high performance to removal the Ni2+ ions from water sample solution.
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