Abstract
In the present study, trace quantities of copper(II) and zinc(II) ions in natural water, herbal and food samples was separated, preconcentrated and determined by a new nanocomposite. The nanocomposite was prepared by immobilization of diphenylcarbazone on SBA-15 nanoparticles coated with anionic surfactant sodium dodecyl sulfate. In order to investigate the effectiveness and size of the surface, SBA-15 nanoparticles and nanocomposites were analyzed by Brunauer–Emmett–Teller technique, transmission electron microscope, elemental analysis map, energy-dispersive X-ray spectroscopy, thermogravimetric analysis and elemental analysis CHNS. The effective factors such as pH, adsorbent amount, extraction time, eluent concentration and acid recovery volume were investigated and optimized for quantitative determination of Cu(II) and Zn(II) ions. Figures of merit such as precision, accuracy, limit of detection, enhancement factor and enrichment factor were obtained with good results. The linear range of the calibration graph was between 0.5 and 100 ng $$\hbox {mL}^{-1}$$ for Cu(II) and between 1 and 500 ng $$\hbox {mL}^{-1}$$ for Zn(II), and the detection limit was calculated to be 0.21 and $$0.93\,\hbox {ng} \,\hbox {mL}^{-1}$$ , respectively. Relative standard deviations of Cu and Zn were calculated to be 1.54 and 1.31%, respectively.
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