title: Use of Al2O3 in an automated on-line pre-concentration system for determination of cadmium(II) by FAAS.
abstract: This paper presents the development of an on-line pre-concentration system to determine cadmium(II) in aqueous samples. The analyte was trapped in a mini-column filled with Al(2)O(3) in the form of macro-spheres obtained by the mixture of Al(NO(3))(3).9H(2)O(aq) and chitosan dissolved in acetic acid. The mixture was dropped into an NH(4)OH aqueous solution under rigorous agitation using a peristaltic pump, the macro-spheres were separated from alkaline solution and dried, and finally were submitted to thermal treatment. The pre-concentration system was linear between 1.0 and 100 microg L(-1), with a linearity of 0.999, sensitivity of 3.58 x 10(-3)L microg(-1) and enrichment factor of 21.9. The limits of detection and quantification were 0.08 microg L(-1) and 0.28 microg L(-1), respectively. The repeatability was between 2.6 and 5.9%. Recovery tests were carried out with a real aqueous sample.
authors.affiliation: Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil.
authors.forename: Erica Silva
authors.initials: ES
authors.lastname: Souza
authors.forename: Amarildo Otavio
authors.initials: AO
authors.lastname: Martins
authors.forename: Humberto Vieira
authors.initials: HV
authors.lastname: Fajardo
authors.forename: Luiz Fernando Dias
authors.initials: LF
authors.lastname: Probst
authors.forename: Eduardo
authors.initials: E
authors.lastname: Carasek
mesh_terms: D000327:Adsorption; D000537:Aluminum Oxide / Q000737:chemistry*; D002104:Cadmium / Q000032:analysis* / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D009862:Online Systems; D015203:Reproducibility of Results; D013054:Spectrophotometry, Atomic; D014881:Water Supply / Q000032:analysis*; D014961:X-Ray Diffraction
chemical_list: D007477:Ions; D002104:Cadmium; D000537:Aluminum Oxide