title: Comparison of activated carbon and oxidized multiwalled carbon nanotubes modified with bis(3-nitrobenzylidene)-1,2-ethanediamine for enrichment of trace amounts of some metal ions.
abstract: The efficiency of modified activated carbon (AC) and multiwalled carbon nanotubes (MWCNTs) for the separation/preconcentration and determination of Co, Cd, Pb, Zn, and Cu following their complexation by bis(3-nitrobenzylidene)-1,2-ethanediamine has been described and compared. A one-at-a-time optimization method investigated the influence of various parameters that significantly influence the recoveries of the studied metal ions. At the optimum values of all variables, the response was linear over the range of 0.01-0.3 microg/mL, and detection limit (3 SDb/m, n = 10) was between 1.41-2.05 ng/mL for both sorbents while the preconcentration factor was 100 for AC and 500 for MWCNTs. The method was successfully applied for preconcentration and determination of trace amount of the aforementioned ions in various real samples such as orange, lettuce, bread, and pear.
authors: Yasouj University, Chemistry Department, Yasouj 75918-74831, Iran. m_ghaedi@mail.yu.ac.ir
authors: Mehrorang
authors: M
authors: Ghaedi
authors: Mortaza
authors: M
authors: Montazerozohori
authors: Maryam
authors: M
authors: Tabatabie
authors: Hamid
authors: H
authors: Noormohamadi
authors: Alireza Borhan
authors: AB
authors: Haghighi
mesh_terms: D000327:Adsorption; D001597:Benzylidene Compounds / Q000737:chemistry*; D001939:Bread / Q000032:analysis; D002244:Carbon / Q000737:chemistry*; D005029:Ethylenediamines / Q000737:chemistry*; D005504:Food Analysis; D005638:Fruit / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D018545:Lactuca / Q000737:chemistry; D008024:Ligands; D008670:Metals / Q000032:analysis*; D019216:Metals, Heavy / Q000032:analysis; D037742:Nanotubes, Carbon / Q000737:chemistry*; D012015:Reference Standards; D052616:Solid Phase Extraction
chemical_list: D001597:Benzylidene Compounds; D005029:Ethylenediamines; D007202:Indicators and Reagents; D008024:Ligands; D008670:Metals; D019216:Metals, Heavy; D037742:Nanotubes, Carbon; C579517:bis(3-nitrobenzylidene)-1,2-ethanediamine; D002244:Carbon