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Analytical Letters Volume 49, 2016 - Issue 5: Special Issue on Automated Flow Injection Based Analytical Techniques
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PRECONCENTRATION TECHNIQUES

Preconcentration of Nickel(II) by a Mini-Flow System with a Novel Ternary Oxide Solid Phase and Flame Atomic Absorption Spectrometry

Nathalia Barbosa WutkeDepartamento de Química, Centro de Ciências Exatas, Universidade Estadual de Londrina (UEL), Londrina, PR, Brazil
,
Kristiany Moreira DinizDepartamento de Química, Centro de Ciências Exatas, Universidade Estadual de Londrina (UEL), Londrina, PR, Brazil
,
Marcela Zanetti CorazzaDepartamento de Química, Centro de Ciências Exatas, Universidade Estadual de Londrina (UEL), Londrina, PR, Brazil
,
Fernanda Midori de OliveiraDepartamento de Química, Centro de Ciências Exatas, Universidade Estadual de Londrina (UEL), Londrina, PR, Brazil
,
Emerson Schwingel RibeiroInstituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
,
Bruna Teixeira da FonsecaInstituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
,
Mariana Gava SegatelliDepartamento de Química, Centro de Ciências Exatas, Universidade Estadual de Londrina (UEL), Londrina, PR, Brazil
&
César Ricardo Teixeira TarleyDepartamento de Química, Centro de Ciências Exatas, Universidade Estadual de Londrina (UEL), Londrina, PR, Brazil;Instituto Nacional de Ciência e Tecnologia (INCT) de Bioanalítica, Universidade Estadual de Campinas (UNICAMP), Instituto de Química, Departamento de Química Analítica, Cidade Universitária Zeferino Vaz, Campinas, SP, BrazilCorrespondence[email protected]; [email protected]
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Pages 723-736 | Received 30 Dec 2014, Accepted 07 Apr 2015, Published online: 22 Feb 2016
 
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ABSTRACT

A SiO2/Al2O3/Sb2O5 mixed oxide was synthesized via a sol-gel method and applied to the on-line preconcentration of Ni(II) with determination by flame atomic absorption spectrometry. The mixed oxide was characterized by infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray fluorescence, thermogravimetric analysis, and the specific surface area. Analysis was performed by percolating 20.0 mL of sample at pH 7.1 through 100 mg of SiO2/Al2O3/Sb2O5 packed into a mini-column at 9.5 mL min−1. Under the optimum conditions, a preconcentration factor of 77.5-fold, linear dynamic range from 5.0 to 270.0 µg L−1, and limits of detection and quantification of 0.48 and 1.61 µg L−1 were obtained. The effects of several concomitant ions were evaluated and no interferences were observed. The method was employed for the analysis of water with good recoveries (92.9–100.6%) and the accuracy was verified by using a marine sediment certified reference material (MESS-3).

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