Environmental Monitoring and Assessment

, Volume 186, Issue 2, pp 961–969 | Cite as

Evaluation of diffusive gradients in thin films technique (DGT) for measuring Al, Cd, Co, Cu, Mn, Ni, and Zn in Amazonian rivers

  • Lauren Nozomi Marques Yabuki
  • Camila Destro Colaço
  • Amauri Antonio Menegário
  • Roberto Naves Domingos
  • Chang Hung Kiang
  • Domitila Pascoaloto
Article

Abstract

Studies concerning the lability and bioavailability of trace metals have played a prominent role in the search for contamination of water resources. This work describes the first application yet of the diffusive gradients in thin films technique (DGT) to the determination of the fraction of free plus labile metals in waters from the Amazon Basin. Due to the complexity of the use of DGT for samples with low ionic strength and high organic matter content (characteristic of Amazonian rivers), a new analytical procedure was developed. The method is based on the determinations of apparent diffusion coefficients (Dap) in the laboratory, by performing deployments in samples collected in the corresponding sites of study. The Dap thereby determined is then used for in situ measurements. The suitability of the proposed approach for determination of labile Al, Cd, Co, Cu, Mn, Ni, and Zn in the Amazon River and Rio Negro (English: Black River) was evaluated. Except for Co, Mn (in a deployment at Rio Negro), Ni and Zn (in a deployment at Amazon River), labile in situ measurements were lower or similar to dissolved concentrations, indicating suitability of the proposed approach.

Keywords

DGT Amazon Basin Lability Trace metals 

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Lauren Nozomi Marques Yabuki
    • 1
    • 2
  • Camila Destro Colaço
    • 1
    • 2
  • Amauri Antonio Menegário
    • 2
  • Roberto Naves Domingos
    • 2
  • Chang Hung Kiang
    • 3
  • Domitila Pascoaloto
    • 4
  1. 1.Programa de Pós-Graduação em Geociências e Meio Ambiente, Instituto de Geociências e Ciências Exatas - IGCEUniversidade Estadual Paulista - UNESPRio ClaroBrazil
  2. 2.Centro de Estudos Ambientais - CEAUniversidade Estadual Paulista - UNESPRio ClaroBrazil
  3. 3.Laboratório de Estudos de Bacias - LEBAC, Instituto de Geociências e Ciências Exatas - IGCEUniversidade Estadual Paulista - UNESPRio ClaroBrazil
  4. 4.Coordenação de Pesquisas em Clima e Recursos HídricosInstituto Nacional de Pesquisas da Amazônia - INPAManausBrazil

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