Flow injection on-line minicolumn preconcentration and determination of trace copper ions using an alumina/titanium oxide grafted silica matrix and FAAS期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Flow injection on-line minicolumn preconcentration and determination of trace copper ions using an alumina/titanium oxide grafted silica matrix and FAAS

Authors:

Giovana F Lima Maikow O Ohara Débora N Clausen Danielle R Nascimento Emerson S Ribeiro Mariana G Segatelli Marcos A Bezerra César R T Tarley

Institution:

1. Programa de Pós-Gradua??o em Química da Universidade Federal de Uberlandia (UFU), Av. Jo?o Naves de ávila, 2121, Campus Santa M?nica, Uberlandia, MG, CEP 38400-902, Brazil
2. Instituto Nacional de Ciência e Tecnologia (INCT) de Bioanalítica, Universidade Estadual de Campinas (UNICAMP), Cidade Universitária Zeferino Vaz s/n, CEP 13083-970, Campinas, Brazil
3. Departamento de Química, Universidade Estadual de Londrina (UEL), Rod. Celso Garcia Cid, PR 445 Km 380, Campus Universitário, Londrina, PR, CEP 86051-990, Brazil
4. Instituto de Química, Universidade Federal do Rio de Janeiro (UFRJ), Avenida Athos da Silveira Ramos, 149, Cidade Universitária, Rio de Janeiro, RJ, CEP 21941-909, Brazil
5. Universidade Estadual do Sudoeste da Bahia (UESB), Rua José Moreira Sobrinho, s/n, Jequiezinho, Jequié, BA, CEP 45201-190, Brazil

Abstract:

We describe the analytical performance of a hybrid material composed of SiO₂, Al₂O₃ and TiO₂. It was prepared by a sol–gel process and can act as an adsorbent in the continuous-flow enrichment of copper. A minicolumn was packed with the material, copper ions are adsorbed at pH 9.13, then eluted with 1.0?mol?L^?1 nitric acid, and determined by FAAS. The material was characterized by infrared spectroscopy, scanning electron and energy dispersive spectroscopy, energy dispersive X-ray fluorescence analysis, powder X-ray diffraction, and specific surface area analysis. No significant interference was observed for most ions in up to copper/interferent ratios of 1:100 and of 1:500 in case of Ca(II), Ba(II), and Mg(II). The breakthrough capacity is 1.4?mg?g^?1 under dynamic conditions. The limits of detection and of quantification are 0.50 and 1.4?μg?L^?1, respectively, and the calibration plot is linear in the range from 5.0 to 245.0?μg?L^?1 (r?=?0.999). The relative standard deviation is 3.20 (for n?=?7 and at a Cu(II) concentration of 10?μg?L^?1). The method was applied to the determination of trace copper ions in water, vegetable and alcohol fuel samples.

Figure
We describe the analytical performance of the hybrid material composed of SiO₂, Al₂O₃ and TiO₂. It was prepared by a sol–gel process and can act as an adsorbent in the continuous-flow enrichment of copper. The method was applied to the determination of trace copper ions in water, vegetable and alcohol fuel samples.

Keywords:

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