title: Impregnated multiwalled carbon nanotubes as efficient sorbent for the solid phase extraction of trace amounts of heavy metal ions in food and water samples.
abstract: A new, sensitive and simple solid phase extraction (SPE), separation and preconcentration method of some heavy metal ions, Cd(II), Cu(II), Ni(II), Pb(II) and Zn(II) at trace levels using multiwalled carbon nanotubes (MWCNTs) impregnated with 2-(2-benzothiazolylazo)orcinol (BTAO) from food and water samples were investigated. The effect of analytical parameters was examined. The metals retained on the nanotubes at pH 7.0 were eluted by 5.0mL HNO3 (2.0molL(-1)). The influence of matrix ions on the proposed method was evaluated. The preconcentration factor was calculated and found to be 100. The detection limits (LODs) for Cd(II), Cu(II), Ni(II), Pb(II) and Zn(II) were found at 0.70, 1.2, 0.80, 2.6 and 2.2μgL(-1), respectively. The relative standard deviation (RSD) and the recoveries of the standard addition method were lower than 5.0% and 95-102%, respectively. The new procedure was successfully applied to the determination of trace amounts of the studied metal ions in various food and water samples and validated using certified reference materials SRM 1570A (spinach leaves) with satisfactory and compatible results.
authors.affiliation: Chemistry Department, Faculty of Sciences, Zagazig University, Zagazig 44519, Egypt. Electronic address: aymangouda77@gmail.com.
authors.forename: Ayman A
authors.initials: AA
authors.lastname: Gouda
authors.affiliation: Chemistry Department, Faculty of Science, University of Dammam, Saudi Arabia.
authors.forename: Sheikha M
authors.initials: SM
authors.lastname: Al Ghannam
mesh_terms: D005504:Food Analysis / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D009682:Magnetic Resonance Spectroscopy; D019216:Metals, Heavy / Q000032:analysis*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D019216:Metals, Heavy; D037742:Nanotubes, Carbon; D014874:Water Pollutants, Chemical
keywords: Flame atomic absorption spectrometry; Food and water samples; Heavy metals; Impregnation; Multiwalled carbon nanotubes; Solid phase extraction