Abstract
A method for the preconcentration of trace heavy metal ions in environmental samples has been reported. The presented method is based on the sorption of Cu(II), Cd(II), Ni(II) and Cr(III) ions with salicylic acid as respective chelate on silica-coated magnetite nanoparticles. Prepared adsorbent was characterized by XRD, SEM, BET and FT-IR measurements. The metals content of the sorbed complexes are eluted using 4.0 mL of 1.0 mol L-1 nitric acid. The influences of the analytical parameters including pH, amount of solid phase and condition of eluting solution, the effects of matrix ions on the retention of the analytes were examined. The accuracy and precision of suggested method were tested by analyzing of certified reference materials. The detection limits (3Sb/m, N = 8) for Cu(II), Cd(II), Ni(II) and Cr(III) ions are 0.22, 0.11, 0.27 and 0.15 μg L-1, respectively, and the maximum preconcentration factor is 200. The method was successfully applied to the evaluation of these trace and toxic metals in various waters, foods and other samples.
Highlights
Heavy metals are released into the environment from industrial applications, including mining, refining and production of textiles, paints and dyes
Silica-coated magnetic nanoparticles modified with Salicylic acid (SA) were synthesized by a sol-gel method. These magnetic nanoparticles were employed as an Solid phase extraction (SPE) adsorbent for separating and concentrating trace amounts of Cu(II), Cd(II), Ni(II) and Cr(III) ions from environmental and various other real matrices prior to their determination by Flame atomic absorption spectrometry (F-AAS) and was found to have superior preconcentration and metal loading ability compared to other adsorbents prepared using salicylic acid as the functional group
This could be attributed to the reaction occurring only on the particle surface, and our attempt to prepare SA-silica coated magnetite nanoparticles in this work has been achieved
Summary
Heavy metals are released into the environment from industrial applications, including mining, refining and production of textiles, paints and dyes. It should be pointed out that pure inorganic nanoparticles (such as Fe3O4 and Fe2O3) can form large aggregates, which may alter their magnetic properties [6,25] These nanometer-sized metal oxides are not target-selective and are unsuitable for samples with complicated matrices. Silica-coated magnetic nanoparticles modified with SA were synthesized by a sol-gel method These magnetic nanoparticles were employed as an SPE adsorbent for separating and concentrating trace amounts of Cu(II), Cd(II), Ni(II) and Cr(III) ions from environmental and various other real matrices prior to their determination by F-AAS and was found to have superior preconcentration and metal loading ability compared to other adsorbents prepared using salicylic acid as the functional group. The propose method was validated by analyzing certified reference materials (both environmental and biological) and by performing recovery studies on water and food samples by F-AAS
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