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Determination of the chemical oxygen demand (COD) using a copper electrode: a clean alternative method

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Abstract

A clean alternative method for the determination of chemical oxygen demand (COD) was developed using a copper electrode as an electrocatalytic sensor. The measuring principle is based on oxidation current of organic compounds in the wastewater. The effects of important experimental conditions, such as electrolytic solution concentration and potential scan rate, on analytical performance have been investigated. Analytical linear range of 53.0–2,801.4 mg l−1 COD with detection limit of 20.3 mg l−1 COD was achieved. The procedure was successfully applied to the COD determination in wastewater from soft industries. The results obtained using the proposed method were in good agreement with those obtained using the conventional (i.e., dichromate) COD method. In this fashion, the COD value of a sample can be determined in a simple, rapid, accurate manner, and the end products do not contain toxic metals.

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Acknowledgments

The financial support by FAPESP is gratefully acknowledged. The authors thank SJT.

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Authors and Affiliations

  1. Departamento de Química, Universidade Federal de São Carlos, CEP 13560-970, São Carlos, SP, Brazil

    Claudineia R. Silva, Cleone D. C. Conceição, Viviane G. Bonifácio & Orlando Fatibello Filho

  2. Departamento de Física, Química e Biologia, Universidade Estadual Paulista – Faculdade de Ciências e Tecnologia, Rua Roberto Simonsen, 305, CEP 19060-900, Presidente Prudente, SP, Brazil

    Marcos F. S. Teixeira

Authors
  1. Claudineia R. Silva
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  2. Cleone D. C. Conceição
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  3. Viviane G. Bonifácio
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  4. Orlando Fatibello Filho
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  5. Marcos F. S. Teixeira
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Correspondence to Marcos F. S. Teixeira.

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Silva, C.R., Conceição, C.D.C., Bonifácio, V.G. et al. Determination of the chemical oxygen demand (COD) using a copper electrode: a clean alternative method. J Solid State Electrochem 13, 665–669 (2009). https://doi.org/10.1007/s10008-008-0580-9

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  • DOI: https://doi.org/10.1007/s10008-008-0580-9

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