title: Selective preconcentration/separation of copper(II), iron(III), and lead(II) as their N'-benzoyl-N,N-diisobutylthiourea chelates on Amberlite XAD-16 resin.
abstract: A preconcentration/separation procedure for copper(II), iron(III), and lead(II) ions has been established for use prior to their flame atomic absorption spectrometric determination. The presented procedure is based on adsorption of analyte ions on Amberlite XAD-16 resin as their N'-benzoyl-N,N-diisobutylthiourea chelates. The influence of analytical parameters including pH of the solutions and type of eluent on the recoveries of Cu(II), Fe(III), and Pb(II) ions was investigated. The recoveries of the analytes were generally > 95%. No interference effects were observed from alkaline, earth alkaline, or transition metals on the recoveries of the studied metals. The LODs based on 3sigma were 1.9 microg/L for Cu, 5.9 microg/L for Fe, and 3.1 microg/L for Pb. Validation of the procedure was carried out by analyzing standard reference material 1568a (rice flour). The procedure was applied to the determination of analytes in natural water samples.
authors.affiliation: University of Erciyes, Faculty of Science Arts, Chemistry Department, 38039 Kayseri, Turkey. soylak@erciyes.edu.tr
authors.forename: Mustafa
authors.initials: M
authors.lastname: Soylak
authors.forename: I Afsin
authors.initials: IA
authors.lastname: Kariper
mesh_terms: D000327:Adsorption; D002614:Chelating Agents; D002623:Chemistry Techniques, Analytical; D003300:Copper / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D007475:Ion Exchange Resins / Q000737:chemistry*; D007477:Ions; D007501:Iron / Q000032:analysis*; D007854:Lead / Q000032:analysis*; D008024:Ligands; D011108:Polymers / Q000737:chemistry; D015203:Reproducibility of Results; D013890:Thiourea / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D002614:Chelating Agents; D007475:Ion Exchange Resins; D007477:Ions; D008024:Ligands; D011108:Polymers; D014867:Water; C074337:Amberlite XAD-16; D007854:Lead; D003300:Copper; D007501:Iron; D013890:Thiourea