期刊
TALANTA
卷 100, 期 -, 页码 71-79出版社
ELSEVIER
DOI: 10.1016/j.talanta.2012.08.023
关键词
Preconcentration; Speciation; Cr(III); Cr(VI); SiO2/Al2O3/TiO2 and SiO2/AAPTMS
资金
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior)
- UFU (Universidade Federal de Uberlandia)
- UEL (Universidade Estadual de Londrina)
- UESB (Universidade Estadual do Sudoeste da Bahia)
- UFRJ (Universidade Federal do Rio de Janeiro)
- INCT for Bianalytics (Institut Nacional de Ciencia e Tecnologia de Bioanalitica)
In the present study, a flow injection system using dual mini-columns, SiO2/Al2O3/TiO2 and silica gel functionalized with [3-(2-aminoethylamino)propyl] trimethoxysilane (SiO2/AAPTMS) for the sequential preconcentration of Cr(III) and Cr(VI), respectively, from water samples with FAAS detection was proposed. A two-level full factorial design (2(4)) and desirability function were employed for the optimization of variables related to the system performance. The detection limits of 0.66 and 0.27 mu g L-1 for Cr(III) and Cr(IV), respectively, were obtained under the optimized preconcentration conditions (flow rate of 7.0 mL min(-1)), pH 5.0, buffer concentration (acetate buffer) of 0.01 mol L-1, and eluent (2.5 mol L-1 HCl) flow rate of 5.0 mL min(-1). The other parameters including preconcentration factor (PF), consumptive index (CI), and concentration efficiency (CE) were found to be 17.62/32.98, 1.13/0.6 mL, and 6.2/11.54 min(-1) for Cr(III)/Cr(VI), respectively. The developed method was applied to the Cr(III) and Cr(VI) determination in water samples [tap, lake and mineral water, artificial saliva and parenteral solutions (physiological serum, water for injection, and glucose physiological solution)]. The method accuracy was checked by the analysis of standard reference materials (trace elements in water). (C) 2012 Elsevier B.V. All rights reserved.
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