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Evaluation of Tungsten Coil Atomic Emission Spectrometry for the Direct Determination of Al in Tea Infusions and Iced Tea

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Abstract

This work describes the determination of aluminum in tea infusions and iced tea by tungsten coil atomic emission spectrometry (WCAES). The instrumentation is simple, inexpensive, and potentially portable. It uses a tungsten filament extracted from 150 W, 15 V commercially available slide projector light bulbs as electrothermal atomizer. A simple power supply that provides a constant potential is used to heat the coil. Tea infusions were directly analyzed by application of an optimized heating program. In order to avoid matrix interferences, the iced tea samples were diluted with an oxidizing mixture composed of hydrogen peroxide and nitric acid and also analyzed by a tailored heating program. Aluminum was quantified in all samples, and the results were in agreement with those obtained by inductively coupled plasma optical emission spectrometry at a 95 % confidence level. The limit of detection and the relative standard deviation for a solution containing 2.5 mg L−1 Al (n = 10) were determined, and the values were 0.09 mg L−1 and 5.1 %, respectively.

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Acknowledgments

The authors would like to thank the financial support provided to this project by the grants 2007/51448-0 and 2010/50238-5, São Paulo Research Foundation (FAPESP). Financial support provided by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) is also greatly appreciated.

Conflict of Interest

Luana N. Santos declares that she has no conflict of interest. Mario H. Gonzalez declares that he has no conflict of interest. Monise F. Moura declares that she has no conflict of interest. George L. Donati declares that he has no conflict of interest. Joaquim A. Nóbrega declares that he has no conflict of interest. This article does not contain any studies with human or animal subjects.

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Authors and Affiliations

  1. Department of Exacts and Technological Ssciences, Santa Cruz State University at Soane Nazaré de Andrade, Ilhéus, BA, 45662-900, Brazil

    Luana N. Santos

  2. Department of Chemistry and Environmental Sciences, Institute of Biosciences, Letters, and Exact Sciences, Santa Cruz State University, 15054-000, São José do Rio Preto, SP, Brazil

    Mário H. Gonzalez

  3. Group of Applied Instrumental Analysis, Department of Chemistry, Federal University of São Carlos, Ilhéus, Ba, Brazil

    Monise F. Moura & Joaquim A. Nóbrega

  4. Department of Chemistry, Wake Forest University, Winston-Salem, NC, 27109, USA

    George L. Donati

Authors
  1. Luana N. Santos
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  2. Mário H. Gonzalez
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  3. Monise F. Moura
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  4. George L. Donati
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  5. Joaquim A. Nóbrega
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Correspondence to Luana N. Santos.

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Santos, L.N., Gonzalez, M.H., Moura, M.F. et al. Evaluation of Tungsten Coil Atomic Emission Spectrometry for the Direct Determination of Al in Tea Infusions and Iced Tea. Food Anal. Methods 9, 624–629 (2016). https://doi.org/10.1007/s12161-015-0212-9

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  • DOI: https://doi.org/10.1007/s12161-015-0212-9

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