title: Simultaneous trace-levels determination of Hg(II) and Pb(II) ions in various samples using a modified carbon paste electrode based on multi-walled carbon nanotubes and a new synthesized Schiff base.
abstract: A modified carbon paste electrode based on multi-walled carbon nanotubes (MWCNTs) and 3-(4-methoxybenzylideneamino)-2-thioxothiazolodin-4-one as a new synthesized Schiff base was constructed for the simultaneous determination of trace amounts of Hg(II) and Pb(II) by square wave anodic stripping voltammetry. The modified electrode showed an excellent selectivity and stability for Hg(II) and Pb(II) determinations and for accelerated electron transfer between the electrode and the analytes. The electrochemical properties and applications of the modified electrode were studied. Operational parameters such as pH, deposition potential and deposition time were optimized for the purpose of determination of traces of metal ions at pH 3.0. Under optimal conditions the limits of detection, based on three times the background noise, were 9.0×10(-4) and 6.0×10(-4) μmol L(-1) for Hg(II) and Pb(II) with a 90 s preconcentration, respectively. In addition, the modified electrode displayed a good reproducibility and selectivity, making it suitable for the simultaneous determination of Hg(II) and Pb(II) in real samples such as sea water, waste water, tobacco, marine and human teeth samples.
authors.affiliation: Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran. afkhami@basu.ac.ir
authors.forename: Abbas
authors.initials: A
authors.lastname: Afkhami
authors.forename: Hasan
authors.initials: H
authors.lastname: Bagheri
authors.forename: Hosein
authors.initials: H
authors.lastname: Khoshsafar
authors.forename: Mohammad
authors.initials: M
authors.lastname: Saber-Tehrani
authors.forename: Masoumeh
authors.initials: M
authors.lastname: Tabatabaee
authors.forename: Ali
authors.initials: A
authors.lastname: Shirzadmehr
mesh_terms: D000818:Animals; D001547:Benzaldehydes / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D055664:Electrochemical Techniques; D004566:Electrodes; D006801:Humans; D007477:Ions / Q000032:analysis / Q000737:chemistry; D007854:Lead / Q000032:analysis* / Q000737:chemistry; D008628:Mercury / Q000032:analysis* / Q000737:chemistry; D037742:Nanotubes, Carbon / Q000737:chemistry*; D033561:Penaeidae / Q000737:chemistry; D015203:Reproducibility of Results; D012236:Rhodanine / Q000031:analogs & derivatives / Q000737:chemistry; D012545:Schiff Bases / Q000737:chemistry; D012623:Seawater / Q000737:chemistry; D014026:Nicotiana / Q000737:chemistry; D014070:Tooth / Q000737:chemistry; D014413:Tuna; D062065:Wastewater / Q000737:chemistry
chemical_list: D001547:Benzaldehydes; D002244:Carbon; D007477:Ions; D007854:Lead; D008628:Mercury; D037742:Nanotubes, Carbon; D012236:Rhodanine; D012545:Schiff Bases; D062065:Wastewater; C024896:4-anisaldehyde