title: Determination of Cu, Ni, and Zn in fuel ethanol by FAAS after enrichment in column packed with 2-aminothiazole-modified silica gel.
abstract: This work describes the synthesis and characterization of 2-aminothiazole-modified silica gel (SiAT), as well as its application for preconcentration (in batch and column technique) of Cu(II), Ni(II) and Zn(II) in ethanol medium. The adsorption capacities of SiAT determined for each metal ion were (mmol g(-1)): Cu(II)=1.20, Ni(II)=1.10 and Zn(II)=0.90. In addition, results obtained in flow experiments, showed a recovery of ca. 100% of the metal ions adsorbed in a column packed with 500 mg of SiAT. The eluent was 2.0 mol L(-1) HCl. The sorption-desorption of the studied metal ions made possible the development of a preconcentration method for metal ions at trace level in fuel ethanol using flame AAS for their quantification.
authors.affiliation: Departamento de Química Analítica, Instituto de Química, UNESP, CP 355, 14800-900, Araraquara, SP, Brazil.
authors.forename: P S
authors.initials: PS
authors.lastname: Roldan
authors.forename: I L
authors.initials: IL
authors.lastname: Alcântara
authors.forename: G R
authors.initials: GR
authors.lastname: Castro
authors.forename: J C
authors.initials: JC
authors.lastname: Rocha
authors.forename: C C F
authors.initials: CC
authors.lastname: Padilha
authors.forename: P M
authors.initials: PM
authors.lastname: Padilha
mesh_terms: D001336:Automobiles; D002614:Chelating Agents; D002845:Chromatography / Q000379:methods*; D003300:Copper / Q000032:analysis; D004736:Energy-Generating Resources; D000431:Ethanol / Q000032:analysis*; D019216:Metals, Heavy / Q000032:analysis*; D009532:Nickel / Q000032:analysis; D058428:Silica Gel; D012822:Silicon Dioxide; D013844:Thiazoles; D015032:Zinc / Q000032:analysis
chemical_list: D002614:Chelating Agents; D019216:Metals, Heavy; D013844:Thiazoles; D000431:Ethanol; C004483:2-aminothiazole; D058428:Silica Gel; D012822:Silicon Dioxide; D003300:Copper; D009532:Nickel; D015032:Zinc