Artículos de revistas
Novel on-line sequential preconcentration system of Cr(III) and Cr(VI) hyphenated with flame atomic absorption spectrometry exploiting sorbents based on chemically modified silica
Registro en:
Talanta. Elsevier Science Bv, v. 100, n. 71, n. 79, 2012.
0039-9140
WOS:000313773300012
10.1016/j.talanta.2012.08.023
Autor
Tarley, CRT
Lima, GF
Nascimento, DR
Assis, ARS
Ribeiro, ES
Diniz, KM
Bezerra, MA
Segatelli, MG
Institución
Resumen
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) 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. 100 71 79 Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) 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) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)